空氣 Air

For All Spaces except Commercial Kitchen Spaces & Industrial: Option 1: Acceptable thresholds The following thresholds are met in occupiable spaces: a. PM2.5: 15 µg/m3 or lower.8 b. PM10: 50 µg/m3 or lower.9 OR Option 2: Modified thresholds in polluted regions Note: Projects pursuing this strategy are limited in WELL Certification level to Gold regardless of total points achieved. For projects where the annual average outdoor PM2.5 level is 35 µg/m3 or higher, the following thresholds are met: a. PM2.5: 25 µg/m3 or lower.10 b. PM10: 50 µg/m3 or lower.10 Note: The World Health Organization’s Global Urban Ambient Air Pollution Database may be consulted to view outdoor air quality levels, available at http://www.who.int/phe/health_topics/outdoorair/databases/cities/en/ OR Option 3: Dynamic thresholds in polluted regions Note: Projects pursuing this strategy are limited in WELL Certification level to Silver regardless of total points achieved. For projects where the annual average outdoor PM2.5 level is 35 µg/m3 or higher, the following thresholds are met: a. PM2.5 less than or equal to 30% of the 24- or 48-hour average of outdoor levels on the day(s) of performance testing. b. PM10 less than or equal to 30% of the 24- or 48-hour average of outdoor levels on the day(s) of performance testing. Note: The World Health Organization’s Global Urban Ambient Air Pollution Database may be consulted to view outdoor air quality levels, available at http://www.who.int/phe/health_topics/outdoorair/databases/cities/en/ For Commercial Kitchen Spaces & Industrial: Option 1: Acceptable thresholds The following threshold is met: a. PM2.5: 35 µg/m³ or lower.8 OR Option 2: Dynamic thresholds in polluted regions Note: Projects pursuing this strategy are limited in WELL Certification level to Silver regardless of total points achieved. For projects where the annual average ambient PM2.5 level is 35 µg/m3 or higher, the following thresholds are met: a. PM2.5 less than or equal to 30% of the 24- or 48-hour average of outdoor levels on the day(s) of performance testing. b. PM10 less than or equal to 30% of the 24- or 48-hour average of outdoor levels on the day(s) of performance testing. Note: The World Health Organization’s Global Urban Ambient Air Pollution Database may be consulted to view outdoor air quality levels, available at http://www.who.int/phe/health_topics/outdoorair/databases/cities/en/ Note: Multifamily residential projects may achieve WELL Certification at the Bronze or Silver level without testing in dwelling units, but cannot achieve Gold or Platinum without testing in dwelling units. See Sampling Rates for Multifamily Residential in the WELL Performance Verification Guidebook for further details. WELL Core Guidance: Meet these requirements in non-leased spaces provided, this areas comprises at least 2.5% of the total project area. Otherwise, meet these requirements in non-leased space plus sufficient leased space to sum to 2.5% of the total project area.

For All Spaces: Option 1: Laboratory-based VOC tests The following thresholds are met in occupiable spaces: a. Benzene (CAS 71-43-2): 10 µg/m³ or lower.11 b. Formaldehyde (CAS 50-00-0): 50 µg/m³ or lower.12 c. Toluene (CAS 108-88-3): 300 µg/m³ or lower.13 OR Option 2: VOC monitoring The following requirements are met: a. Sensors to measure total VOC at least once per hour (with accuracy 20 µg/m³ + 20% of reading at values between 150 and 2000 µg/m³) are installed with a density of at least one per every 3,500 ft2(325 m2). b. Data covering at least the previous one month demonstrate total VOC levels of 500 µg/m³ or lower for at least 90% of regularly occupied hours for all sensors. Note: Projects undergoing recertification which were previously awarded Feature A08 must consider all data collected since the previous (re)certification. Note: Multifamily residential projects may achieve WELL Certification at the Bronze or Silver level without testing in dwelling units, but cannot achieve Gold or Platinum without testing in dwelling units. See Sampling Rates for Multifamily Residential in the WELL Performance Verification Guidebook for further details. WELL Core Guidance: Meet these requirements in non-leased spaces provided, this areas comprises at least 2.5% of the total project area. Otherwise, meet these requirements in non-leased space plus sufficient leased space to sum to 2.5% of the total project area.

For All Spaces except Commercial Kitchen Spaces & Industrial: The following thresholds are met in occupiable spaces: a. Carbon monoxide: 10 mg/m³ [9 ppm] or lower.8 b. Ozone: 100 µg/m³ [51 ppb] or lower. 10 For Commercial Kitchen Spaces & Industrial: The following thresholds are met: a. Carbon monoxide: 34 mg/m³ [30 ppm] or lower.14 b. Ozone: 100 µg/m³ [51 ppb] or lower. 10 Note: Multifamily residential projects may achieve WELL Certification at the Bronze or Silver level without testing in dwelling units, but cannot achieve Gold or Platinum without testing in dwelling units. See Sampling Rates for Multifamily Residential in the WELL Performance Verification Guidebook for further details. WELL Core Guidance: Meet these requirements in non-leased spaces provided, this areas comprises at least 2.5% of the total project area. Otherwise, meet these requirements in non-leased space plus sufficient leased space to sum to 2.5% of the total project area.

For All Spaces: For regularly occupied spaces at or below grade, one of the following requirements is met: a. The radon is 0.15 Bq/L [4 pCi/L] or lower, as tested by a professional demonstrated not to have a conflict of interest with the WELL project. One test is conducted per 25,000 ft2(2300 m2) of regularly occupied space at or below grade. b. All regularly occupied spaces at or below grade meet Feature A03, Part 1, Option 1. WELL Core Guidance: Meet these requirements in non-leased spaces provided, this areas comprises at least 2.5% of the total project area. Otherwise, meet these requirements in non-leased space plus sufficient leased space to sum to 2.5% of the total project area.

For All Spaces except Dwelling Units: The following requirements are met: a. The pollutants listed in Parts 1-3 of this feature are monitored in regularly occupied spaces at intervals no longer than once per year, and the results are submitted annually through the WELL digital platform. b. The number and location of sampling points for on-going monitoring complies with the requirements outlined in the Performance Verification Guidebook. Note: Projects are not required to use devices that comply with the requirements described in the Performance Verification Guidebook. Projects may monitor total VOCs, instead of the individual VOCs listed in Part 2: Meet Thresholds for Organic Gases. However, if measurements are undertaken by a WELL Performance Testing Agent in compliance with the Performance Verification Guidebook, results submitted to GBCI from each year and test location may be averaged and utilized for recertification purposes. WELL Core Guidance: Meet these requirements in non-leased spaces. References 1. Klepeis NE, Nelson WC, Ott WR, et al. The National Human Activity Pattern Survey (NHAPS): A resource for assessing exposure to environmental pollutants. J Expo Anal Environ Epidemiol. 2001;11(3):231-252. doi:10.1038/sj.jea.7500165 2. Joshi S. The sick building syndrome. Indian J Occup Environ Med. 2008;12(2):61. doi:10.4103/0019-5278.43262 3. Selgrade MK, Plopper CG, Gilmour MI, Conolly RB, Foos BSP. Assessing the health effects and risks associated with children’s inhalation exposures - Asthma and allergy. J Toxicol Environ Heal - Part A Curr Issues. 2008;71(3):196-207. doi:10.1080/15287390701597897 4. U.S. Environmental Protection Agency. Indoor Air Pollution: An Introduction for Health Professionals. https://www.epa.gov/indoor-air-quality-iaq/indoor-air-pollution-introduction-health-professionals. 5. Jacobs DE, Kelly T, Sobolewski J. Linking public health, housing, and indoor environmental policy: Successes and challenges at local and federal agencies in the United States. Environ Health Perspect. 2007;115(6):976-982. doi:10.1289/ehp.8990 6. Cooperative Extension Service, University of Kentucky. Common Indoor Air Pollutants: Sources And Health Impacts. 2000. http://www2.ca.uky.edu/hes/fcs/factshts/HF-LRA.161.PDF. 7. U.S. Environmental Protection Agency. Volatile Organic Compounds’ Impact on Indoor Air Quality. https://www.epa.gov/indoor-air-quality-iaq/volatile-organic-compounds-impact-indoor-air-quality. 8. Wallace LA, Pellizzari E, Leaderer B, Zelon H, Sheldon L. Emissions of volatile organic compounds from building materials and consumer products. Atmos Environ. 1987;21(2):385-393. doi:10.1016/0004-6981(87)90017-5 9. Takaro TK, Krieger J, Song L, Sharify D, Beaudet N. The Breathe-Easy home: The impact of asthma-friendly home construction on clinical outcomes and trigger exposure. Am J Public Health. 2011;101(1):55-62. doi:10.2105/AJPH.2010.300008 10. Krieger J, Jacobs DE, Ashley PJ, et al. Housing interventions and control of asthma-related indoor biologic agents: a review of the evidence. J Pu

For All Spaces: The following requirement is met: a. Smoking and the use of e-cigarettes is prohibited in interior spaces within the project boundary.12 WELL Core Guidance: Meet these requirements in the whole building.

For All Spaces: Smoking and the use of e-cigarettes is prohibited in the following areas, with signage present to clearly communicate the ban: a. Outdoors at ground level within 25 ft(7.5 m) (or the maximum extent allowable by local codes) of all entrances, operable windows and building air intakes.13 Signage is present to clearly communicate the ban. In outdoor areas within the project boundary that allow smoking (if any), signs are placed along walkways (not more than 100 ft(30 m) between signs) that describe the hazards of smoking.14 b. On decks, patios, balconies, rooftops and other occupiable outdoor areas above ground level. WELL Core Guidance: Meet these requirements in the whole building. References 1. Klepeis NE, Nelson WC, Ott WR, et al. The National Human Activity Pattern Survey (NHAPS): A resource for assessing exposure to environmental pollutants. J Expo Anal Environ Epidemiol. 2001;11(3):231-252. doi:10.1038/sj.jea.7500165 2. Joshi S. The sick building syndrome. Indian J Occup Environ Med. 2008;12(2):61. doi:10.4103/0019-5278.43262 3. Selgrade MK, Plopper CG, Gilmour MI, Conolly RB, Foos BSP. Assessing the health effects and risks associated with children’s inhalation exposures - Asthma and allergy. J Toxicol Environ Heal - Part A Curr Issues. 2008;71(3):196-207. doi:10.1080/15287390701597897 4. U.S. Environmental Protection Agency. Indoor Air Pollution: An Introduction for Health Professionals. https://www.epa.gov/indoor-air-quality-iaq/indoor-air-pollution-introduction-health-professionals. 5. Jacobs DE, Kelly T, Sobolewski J. Linking public health, housing, and indoor environmental policy: Successes and challenges at local and federal agencies in the United States. Environ Health Perspect. 2007;115(6):976-982. doi:10.1289/ehp.8990 6. Cooperative Extension Service, University of Kentucky. Common Indoor Air Pollutants: Sources And Health Impacts. 2000. http://www2.ca.uky.edu/hes/fcs/factshts/HF-LRA.161.PDF. 7. U.S. Environmental Protection Agency. Volatile Organic Compounds’ Impact on Indoor Air Quality. https://www.epa.gov/indoor-air-quality-iaq/volatile-organic-compounds-impact-indoor-air-quality. 8. Wallace LA, Pellizzari E, Leaderer B, Zelon H, Sheldon L. Emissions of volatile organic compounds from building materials and consumer products. Atmos Environ. 1987;21(2):385-393. doi:10.1016/0004-6981(87)90017-5 9. Takaro TK, Krieger J, Song L, Sharify D, Beaudet N. The Breathe-Easy home: The impact of asthma-friendly home construction on clinical outcomes and trigger exposure. Am J Public Health. 2011;101(1):55-62. doi:10.2105/AJPH.2010.300008 10. Krieger J, Jacobs DE, Ashley PJ, et al. Housing interventions and control of asthma-related indoor biologic agents: a review of the evidence. J Public Health Manag Pract. 2010;16(5 Suppl):S11-S20. doi:10.1097/phh.0b013e3181fce56a 11. Health Effects Institute. A Special Report on Global Exposure To Air Pollution and Its Disease Burden.; 2017. https://ccacoalition.org/en/resources/state-global-air-2017-special-report-global-exposure-air-po

For All Spaces: Option 1: Mechanically ventilated spaces For mechanically ventilated projects, one of the following requirements is met: a. Newly installed ventilation systems are designed to meet the supply and exhaust rates set in one or more of the following ventilation guidelines, which must describe ventilation rates for at least 90% of the project area. The ventilation system is scheduled to be tested and balanced after project occupancy: 1. ASHRAE 62.1-2010 or any more recent versions (Ventilation Rate Procedure or IAQ Procedure).12 2. ASHRAE 62.2-2016.13 3. EN 16798-1 (for Category IV buildings).14 4. AS 1668.2-2012 or any more recent version.15 5. CIBSE Guide A: Environmental Design, version 2007 or any more recent version.16 b. Existing ventilation systems have been tested and balanced to meet supply and exhaust rates set in one or more ventilation guidelines listed above within the last five years. OR Option 2: Naturally ventilated spaces For naturally ventilated projects with no mechanical ventilation, the following requirements are met: a. One or more of the following design criteria, which must describe ventilation rates for at least 90% of the project area: 1. Natural Ventilation Procedure in ASHRAE 62.1-2010 or any more recent version.12 2. CIBSE AM10: Natural Ventilation in Non-Domestic Buildings (2005 or any more recent version) Section 2.4 – Natural ventilation strategies and Chapter 4 – Design Calculations. 17 3. AS 1668.4-2012 or any more recent version.15 4. Any reference in Option 1, which describes natural ventilation procedures. b. Vents and windows used to meet the ventilation requirements in one of the standards mentioned above are permanently open or have controls to prevent their closure during periods of occupancy. (Operable windows not used in ventilation calculations may be user operated.) c. Outdoor air meets the following thresholds as an average for the previous year: 1. PM2.5 less than 15 µg/m³.18 2. PM 10 less than 30 µg/m³.18 OR Option 3: Naturally ventilated spaces in areas with elevated particulate matter Note: Projects pursuing this strategy are limited in WELL Certification level to Silver regardless of total points achieved. For naturally ventilated projects with no mechanical ventilation, the following requirements are met: a. One or more of the following design criteria, which must describe ventilation rates for at least 90% of the project area: 1. Natural Ventilation Procedure in ASHRAE 62.1-2010 or any more recent version.12 2. CIBSE AM10: Natural Ventilation in Non-Domestic Buildings (2005 or any more recent version) Section 2.4 – Natural ventilation strategies and Chapter 4 – Design Calculations. 17 3. AS 1668.4-2012 or any more recent version.15 4. Any reference in Option 1, which describes natural ventilation procedures. b. Vents and windows used to meet the ventilation requirements in one of the standards mentioned above are permanently open or have

For All Spaces: For construction occurring after project registration, the following requirements are met: a. Ducts are maintained per one of the below: 1. Ducts are sealed and protected from possible contamination during construction.5 2. Ducts are cleaned prior to installing registers, grills and diffusers. b. If permanently installed ventilation system is operating during construction, filters must meet the following: 1. Media filters with a PM10 removal rating of at least 70% (e.g., MERV 8) are used to filter return air.6 2. All filters are replaced prior to occupancy.5 c. The project implements the following moisture and dust management procedures: 1. Carpets, acoustical ceiling panels, fabric wall coverings, insulation, upholstery and furnishings and other absorptive materials are stored separately in a designated area protected from moisture damage.5 2. All active areas of work are isolated from other spaces by sealed doorways or windows or through the use of temporary barriers.5 3. Walk-off mats are used at entryways to reduce the transfer of dirt and pollutants.5 4. Saws and similar tools use dust guards or collectors to capture generated dust.5 WELL Core Guidance: Meet these requirements for the extent of developer build out. References 1. Klepeis NE, Nelson WC, Ott WR, et al. The National Human Activity Pattern Survey (NHAPS): A resource for assessing exposure to environmental pollutants. J Expo Anal Environ Epidemiol. 2001;11(3):231-252. doi:10.1038/sj.jea.7500165 2. Joshi S. The sick building syndrome. Indian J Occup Environ Med. 2008;12(2):61. doi:10.4103/0019-5278.43262 3. Selgrade MK, Plopper CG, Gilmour MI, Conolly RB, Foos BSP. Assessing the health effects and risks associated with children’s inhalation exposures - Asthma and allergy. J Toxicol Environ Heal - Part A Curr Issues. 2008;71(3):196-207. doi:10.1080/15287390701597897 4. U.S. Environmental Protection Agency. Indoor Air Pollution: An Introduction for Health Professionals. https://www.epa.gov/indoor-air-quality-iaq/indoor-air-pollution-introduction-health-professionals. 5. Jacobs DE, Kelly T, Sobolewski J. Linking public health, housing, and indoor environmental policy: Successes and challenges at local and federal agencies in the United States. Environ Health Perspect. 2007;115(6):976-982. doi:10.1289/ehp.8990 6. Cooperative Extension Service, University of Kentucky. Common Indoor Air Pollutants: Sources And Health Impacts. 2000. http://www2.ca.uky.edu/hes/fcs/factshts/HF-LRA.161.PDF. 7. U.S. Environmental Protection Agency. Volatile Organic Compounds’ Impact on Indoor Air Quality. https://www.epa.gov/indoor-air-quality-iaq/volatile-organic-compounds-impact-indoor-air-quality. 8. Wallace LA, Pellizzari E, Leaderer B, Zelon H, Sheldon L. Emissions of volatile organic compounds from building materials and consumer products. Atmos Environ. 1987;21(2):385-393. doi:10.1016/0004-6981(87)90017-5 9. Takaro TK, Krieger J, Song L, Sharify D, Beaudet N. The Breathe-Easy home:

WELL Certification: 2 Pt | WELL Core: 2 Pt For All Spaces: The following requirement is met: a. Projects comply with the thresholds specified in the table below: Particulate Matter Thresholds Points PM2.5: 12 µg/m³ or lower.8 1 PM10: 30 µg/m³ or lower.9 PM2.5: 10 µg/m³ or lower.9 2 PM10: 20 µg/m³ or lower.9 WELL Core Guidance: Meet these requirements in the whole building. Achievement requires access to at least 10% of leased space for testing as identified by the project.

WELL Certification: 1 Pt | WELL Core: 1 Pt For All Spaces: The following thresholds are met in occupiable spaces: a. Acetaldehyde: 140 µg/m³ or lower. 10 b. Acrylonitrile: 5 µg/m³ or lower.10 c. Benzene: 3 µg/m³ or lower.10 d. Caprolactam: 2.2 µg/m³ or lower.10 e. Formaldehyde: 9 µg/m³ or lower.10 f. Naphthalene: 9 µg/m³ or lower.10 g. Toluene: 300 µg/m³ or lower.10 WELL Core Guidance: Meet these requirements in the whole building. Achievement requires access to at least 10% of leased space for testing as identified by the project.

WELL Certification: 1 Pt | WELL Core: 1 Pt For All Spaces: The following thresholds are met: a. Carbon monoxide: 7 mg/m³ [6 ppm] or lower.11 b. Nitrogen dioxide: 40 µg/m³ [21 ppb] or lower. 11 WELL Core Guidance: Meet these requirements in the whole building. Achievement requires access to at least 10% of leased space for testing as identified by the project. References 1. Klepeis NE, Nelson WC, Ott WR, et al. The National Human Activity Pattern Survey (NHAPS): A resource for assessing exposure to environmental pollutants. J Expo Anal Environ Epidemiol. 2001;11(3):231-252. doi:10.1038/sj.jea.7500165 2. Joshi S. The sick building syndrome. Indian J Occup Environ Med. 2008;12(2):61. doi:10.4103/0019-5278.43262 3. Selgrade MK, Plopper CG, Gilmour MI, Conolly RB, Foos BSP. Assessing the health effects and risks associated with children’s inhalation exposures - Asthma and allergy. J Toxicol Environ Heal - Part A Curr Issues. 2008;71(3):196-207. doi:10.1080/15287390701597897 4. U.S. Environmental Protection Agency. Indoor Air Pollution: An Introduction for Health Professionals. https://www.epa.gov/indoor-air-quality-iaq/indoor-air-pollution-introduction-health-professionals. 5. Jacobs DE, Kelly T, Sobolewski J. Linking public health, housing, and indoor environmental policy: Successes and challenges at local and federal agencies in the United States. Environ Health Perspect. 2007;115(6):976-982. doi:10.1289/ehp.8990 6. Cooperative Extension Service, University of Kentucky. Common Indoor Air Pollutants: Sources And Health Impacts. 2000. http://www2.ca.uky.edu/hes/fcs/factshts/HF-LRA.161.PDF. 7. U.S. Environmental Protection Agency. Volatile Organic Compounds’ Impact on Indoor Air Quality. https://www.epa.gov/indoor-air-quality-iaq/volatile-organic-compounds-impact-indoor-air-quality. 8. Wallace LA, Pellizzari E, Leaderer B, Zelon H, Sheldon L. Emissions of volatile organic compounds from building materials and consumer products. Atmos Environ. 1987;21(2):385-393. doi:10.1016/0004-6981(87)90017-5 9. Takaro TK, Krieger J, Song L, Sharify D, Beaudet N. The Breathe-Easy home: The impact of asthma-friendly home construction on clinical outcomes and trigger exposure. Am J Public Health. 2011;101(1):55-62. doi:10.2105/AJPH.2010.300008 10. Krieger J, Jacobs DE, Ashley PJ, et al. Housing interventions and control of asthma-related indoor biologic agents: a review of the evidence. J Public Health Manag Pract. 2010;16(5 Suppl):S11-S20. doi:10.1097/phh.0b013e3181fce56a 11. Health Effects Institute. A Special Report on Global Exposure To Air Pollution and Its Disease Burden.; 2017. https://ccacoalition.org/en/resources/state-global-air-2017-special-report-global-exposure-air-pollution-and- its-disease-burden. 12. Gakidou E, Afshin A, Abajobir AA, et al. Global, regional, and national comparative risk assessment of 84 behavioural, environmental and occupational, and metabolic risks or clusters of risks, 1990-2016: A systematic analysis for the Global Burden of Disease Study 2016. Lancet. 2017;390(10100):1345-1422

WELL Certification: 2 Pt | WELL Core: 3 Pt For All Spaces: Option 1: Increased air supply For mechanically ventilated projects, the following requirement is met in all occupiable spaces: a. Exceed outdoor air supply rates described in ASHRAE 62.1-2010 by the percentages shown in the table below: Thresholds Points 30% 1(2 ) 60% 2(3) OR Option 2: Demand control ventilation For mechanically ventilated projects, the following requirements are met in at least 90% of regularly occupied spaces: a. A demand-controlled ventilation (DCV) system regulates the outdoor air ventilation rate to keep CO2 levels less than the thresholds specified in the table below, at the maximum intended occupancy: Threshold Threshold Points 900 ppm OR 500 ppm above outdoor levels 1(2 ) 750 ppm OR 350 ppm above outdoor levels 2(3) b. Carbon dioxide is measured at the return air diffusers or in the breathing zone at least 3.3 ft(1 m) away from doors, windows, air supply diffusers or occupants. At least one sensor is used for each occupancy zone (or per air handling unit, if a single zone is served by multiple air handling units). If the occupancy density/pattern/usage is substantially different in two adjacent areas, each area must be considered a separate zone. OR Option 3: Enhanced natural ventilation For naturally ventilated projects, the following requirement is met: a. Implement an engineered natural ventilation system that is sufficient to keep CO2 levels in the breathing zone of all regularly occupied spaces below the specified thresholds at the maximum intended occupancies: Threshold Threshold Points 900 ppm OR 500 ppm above outdoor levels 1(2 ) 750 ppm OR 350 ppm above outdoor levels 2(3) Note: Mixed-mode projects must select the option corresponding to the ventilation mode (mechanical and natural ventilation) in operation for the majority of operating hours within the year. WELL Core Guidance: Meet these requirement in the whole building. If the project pursues Option 1 or Option 2, it must provide leased spaces with sufficient outdoor air and a compatible control system (as applicable) but is not required to install ducts and diffusers within leased spaces.

WELL Certification: 1 Pt | WELL Core: 2 Pt For All Spaces: Option 1: Displacement ventilation system The project uses a displacement ventilation system in at least 90% of regularly occupied spaces, with one of the following as a basis for design: a. ASHRAE Guidelines RP-949.9 b. ASHRAE 62.1-2019, "Stratified Air Distribution Systems (Section 6.2.1.2.1).10 c. REHVA Guidebook No. 01 (Displacement Ventilation in non-industrial premises).11 OR Option 2: Personalized ventilation system For at least 50% of workstations, the following requirements are met: a. Outdoor air is supplied in the breathing zone, with an airspeed of no greater than 50 fpm(0.25 m/s) at the occupant's head.10 b. The return air diffusers are located more than 9.8 ft(2.8 m) above the floor.10 WELL Core Guidance: Meet these requirements in the whole building. References 1. Klepeis NE, Nelson WC, Ott WR, et al. The National Human Activity Pattern Survey (NHAPS): A resource for assessing exposure to environmental pollutants. J Expo Anal Environ Epidemiol. 2001;11(3):231-252. doi:10.1038/sj.jea.7500165 2. Joshi S. The sick building syndrome. Indian J Occup Environ Med. 2008;12(2):61. doi:10.4103/0019-5278.43262 3. Selgrade MK, Plopper CG, Gilmour MI, Conolly RB, Foos BSP. Assessing the health effects and risks associated with children’s inhalation exposures - Asthma and allergy. J Toxicol Environ Heal - Part A Curr Issues. 2008;71(3):196-207. doi:10.1080/15287390701597897 4. U.S. Environmental Protection Agency. Indoor Air Pollution: An Introduction for Health Professionals. https://www.epa.gov/indoor-air-quality-iaq/indoor-air-pollution-introduction-health-professionals. 5. Jacobs DE, Kelly T, Sobolewski J. Linking public health, housing, and indoor environmental policy: Successes and challenges at local and federal agencies in the United States. Environ Health Perspect. 2007;115(6):976-982. doi:10.1289/ehp.8990 6. Cooperative Extension Service, University of Kentucky. Common Indoor Air Pollutants: Sources And Health Impacts. 2000. http://www2.ca.uky.edu/hes/fcs/factshts/HF-LRA.161.PDF. 7. U.S. Environmental Protection Agency. Volatile Organic Compounds’ Impact on Indoor Air Quality. https://www.epa.gov/indoor-air-quality-iaq/volatile-organic-compounds-impact-indoor-air-quality. 8. Wallace LA, Pellizzari E, Leaderer B, Zelon H, Sheldon L. Emissions of volatile organic compounds from building materials and consumer products. Atmos Environ. 1987;21(2):385-393. doi:10.1016/0004-6981(87)90017-5 9. Takaro TK, Krieger J, Song L, Sharify D, Beaudet N. The Breathe-Easy home: The impact of asthma-friendly home construction on clinical outcomes and trigger exposure. Am J Public Health. 2011;101(1):55-62. doi:10.2105/AJPH.2010.300008 10. Krieger J, Jacobs DE, Ashley PJ, et al. Housing interventions and control of asthma-related indoor biologic agents: a review of the evidence. J Public Health Manag Pract. 2010;16(5 Suppl):S11-S20. doi:10.1097/phh.0b013e3181fce56a 11. Health Effects Institute. A Special Report on Global Exposure To Air Pollution and Its Dis

WELL Certification: 1 Pt | WELL Core: 2 Pt Note: Projects where the average outdoor PM2.5 level is 35 µg/m³ or higher may only achieve Part 1: Provide Operable Windows in conjunction with Part 2: Manage Window Use. The World Health Organization’s Global Urban Ambient Air Pollution Database may be consulted to view outdoor air quality levels, available at http://www.who.int/phe/health_topics/outdoorair/databases/cities/en/. For All Spaces: The following requirement is met: a. Project meets one of the below: 1. At least 75% of the regularly occupied spaces have operable windows that provide access to outdoor air. 2. For each floor, the openable window area is at least 4% of the net occupiable floor area. WELL Core Guidance: Meet these requirements in the whole building. For area calculations, projects may use assumptions of regularly occupied spaces in leased spaces.

WELL Certification: 1 Pt | WELL Core: 2 Pt Note: Projects may only achieve this part if Part 1 is also achieved. For All Spaces: Option 1: Outdoor air measurement The following requirement is met: a. Outdoor levels of PM2.5, temperature and humidity are monitored at intervals of at least once per hour, based on a data-gathering station located within 2.5 mi(4 km) of the building. This monitoring system may be operated by the project or by another entity (e.g., a government). Option 2: Window operation Indicator lights at windows (at least one per room with windows) cue occupants when the conditions outside are suitable for opening windows: a. PM2.5: 15 µg/m³ or lower. b. Dry-bulb temperature: within 15 °F(8 °C) of indoor air temperature setpoint. c. Relative Humidity: 65% or lower. WELL Core Guidance: Meet these requirements in the whole building. References 1. Klepeis NE, Nelson WC, Ott WR, et al. The National Human Activity Pattern Survey (NHAPS): A resource for assessing exposure to environmental pollutants. J Expo Anal Environ Epidemiol. 2001;11(3):231-252. doi:10.1038/sj.jea.7500165 2. Joshi S. The sick building syndrome. Indian J Occup Environ Med. 2008;12(2):61. doi:10.4103/0019-5278.43262 3. Selgrade MK, Plopper CG, Gilmour MI, Conolly RB, Foos BSP. Assessing the health effects and risks associated with children’s inhalation exposures - Asthma and allergy. J Toxicol Environ Heal - Part A Curr Issues. 2008;71(3):196-207. doi:10.1080/15287390701597897 4. U.S. Environmental Protection Agency. Indoor Air Pollution: An Introduction for Health Professionals. https://www.epa.gov/indoor-air-quality-iaq/indoor-air-pollution-introduction-health-professionals. 5. Jacobs DE, Kelly T, Sobolewski J. Linking public health, housing, and indoor environmental policy: Successes and challenges at local and federal agencies in the United States. Environ Health Perspect. 2007;115(6):976-982. doi:10.1289/ehp.8990 6. Cooperative Extension Service, University of Kentucky. Common Indoor Air Pollutants: Sources And Health Impacts. 2000. http://www2.ca.uky.edu/hes/fcs/factshts/HF-LRA.161.PDF. 7. U.S. Environmental Protection Agency. Volatile Organic Compounds’ Impact on Indoor Air Quality. https://www.epa.gov/indoor-air-quality-iaq/volatile-organic-compounds-impact-indoor-air-quality. 8. Wallace LA, Pellizzari E, Leaderer B, Zelon H, Sheldon L. Emissions of volatile organic compounds from building materials and consumer products. Atmos Environ. 1987;21(2):385-393. doi:10.1016/0004-6981(87)90017-5 9. Takaro TK, Krieger J, Song L, Sharify D, Beaudet N. The Breathe-Easy home: The impact of asthma-friendly home construction on clinical outcomes and trigger exposure. Am J Public Health. 2011;101(1):55-62. doi:10.2105/AJPH.2010.300008 10. Krieger J, Jacobs DE, Ashley PJ, et al. Housing interventions and control of asthma-related indoor biologic agents: a review of the evidence. J Public Health Manag Pract. 2010;16(5 Suppl):S11-S20. doi:10.1097/phh.0b013e3181fce56a 11. Health Effects Institute. A Special Report on Global Expos

WELL Certification: 1 Pt | WELL Core: 0.5 Pt For All Spaces: Option 1: Sensor requirements The following requirements are met: a. The project deploys monitors that measure at least three of the following parameters: 1. PM2.5 or PM10 (accuracy 25% at 50 µg/m³). 2. Carbon dioxide (accuracy 10% at 750 ppm). 3. Carbon monoxide (accuracy 1 ppm at values between 0 and 10 ppm). 4. Ozone (accuracy 10 ppb at values between 0 and 100 ppb). 5. Nitrogen dioxide (accuracy 20 ppb at values between 0 and 100 ppb). 6. Total VOCs (accuracy 25% at 500 µg/m³). 7. Formaldehyde (accuracy 20 ppb at values between 0 and 100 ppb). b. Monitors are sited at locations compliant with relevant parameters in the Performance Verification Guidebook. Monitor density is at least one sensor per 3500 ft2(325 m2). c. Measurements are taken at intervals of no longer than 10 minutes for carbon dioxide and no longer than one hour for other pollutants. Option 2: Reporting & maintenance The following requirements are met: a. Data are submitted annually through the WELL digital platform. b. Monitors are recalibrated or replaced annually, and projects submit documentation attesting to their calibration or replacement annually through the WELL digital platform. WELL Core Guidance: Meet these requirements in non-leased spaces. To earn an additional point, also measure environmental parameters in all leased spaces.

WELL Certification: 1 Pt | WELL Core: 1 Pt For All Spaces: Note: Projects may only receive points for this part, if Part 1 is also achieved Information about the air quality measured in Part 1 of this feature is made available to occupants as follows: a. Data are presented through one of the following: 1. Display screens prominently positioned at a height of 3.6–5.6 ft(1.1–1.7 m) with at least one display per 3500 ft2(325 m2) of regularly occupied space. 2. Hosted on a website or phone application accessible to occupants. Signs are present indicating where the data may be accessed at a density of at least one sign per 3500 ft2(325 m2) of regularly occupied space. b. Data presented include one of the following: 1. Concentrations of the parameters measured. 2. Qualitative results of air quality (e.g., colored-coded levels). WELL Core Guidance: Meet these requirements in non-leased spaces. Data displays must be placed in tenant-accessible areas or otherwise be made available to tenants. References 1. Klepeis NE, Nelson WC, Ott WR, et al. The National Human Activity Pattern Survey (NHAPS): A resource for assessing exposure to environmental pollutants. J Expo Anal Environ Epidemiol. 2001;11(3):231-252. doi:10.1038/sj.jea.7500165 2. Joshi S. The sick building syndrome. Indian J Occup Environ Med. 2008;12(2):61. doi:10.4103/0019-5278.43262 3. Selgrade MK, Plopper CG, Gilmour MI, Conolly RB, Foos BSP. Assessing the health effects and risks associated with children’s inhalation exposures - Asthma and allergy. J Toxicol Environ Heal - Part A Curr Issues. 2008;71(3):196-207. doi:10.1080/15287390701597897 4. U.S. Environmental Protection Agency. Indoor Air Pollution: An Introduction for Health Professionals. https://www.epa.gov/indoor-air-quality-iaq/indoor-air-pollution-introduction-health-professionals. 5. Jacobs DE, Kelly T, Sobolewski J. Linking public health, housing, and indoor environmental policy: Successes and challenges at local and federal agencies in the United States. Environ Health Perspect. 2007;115(6):976-982. doi:10.1289/ehp.8990 6. Cooperative Extension Service, University of Kentucky. Common Indoor Air Pollutants: Sources And Health Impacts. 2000. http://www2.ca.uky.edu/hes/fcs/factshts/HF-LRA.161.PDF. 7. U.S. Environmental Protection Agency. Volatile Organic Compounds’ Impact on Indoor Air Quality. https://www.epa.gov/indoor-air-quality-iaq/volatile-organic-compounds-impact-indoor-air-quality. 8. Wallace LA, Pellizzari E, Leaderer B, Zelon H, Sheldon L. Emissions of volatile organic compounds from building materials and consumer products. Atmos Environ. 1987;21(2):385-393. doi:10.1016/0004-6981(87)90017-5 9. Takaro TK, Krieger J, Song L, Sharify D, Beaudet N. The Breathe-Easy home: The impact of asthma-friendly home construction on clinical outcomes and trigger exposure. Am J Public Health. 2011;101(1):55-62. doi:10.2105/AJPH.2010.300008 10. Krieger J, Jacobs DE, Ashley PJ, et al. Housing interventions and control of asthma-related indoor biologic agent

WELL Certification: 1 Pt | WELL Core: 2 Pt For All Spaces: Option 1: Building entry design The following requirements are met: a. All regularly used entrances to the building that open to a pedestrian network include an entryway system composed of grilles, grates, slots or rollout mats or removable carpet tiles that are at least the width of the entrance and 10 ft(3 m) long in the primary direction of travel (sum of indoor and outdoor length).7 b. One of the below is in place to slow the movement of air from outdoors to indoors: 1. Building entry vestibule with two typically closed doorways. 2. Revolving entrance doors. Option 2: Building entry maintenance Building entryway systems are cleaned, as follows: a. Wet-cleaned at least once a week, or as instructed by manufacturer. b. Vacuumed at least once a day, or as instructed by manufacturer. Option 3: Outdoor sport areas The following requirement is met: a. All facilities adjacent to an outdoor sports field have a staging area that separates the playing field from other internal areas to capture moisture and debris. 8 WELL Core Guidance: Meet these requirements in the whole building.

WELL Certification: 1 Pt | WELL Core: 2 Pt For All Spaces: For projects undergoing design and construction, the following requirements are met: a. The project uses a façade engineer that is responsible for defining the building envelope performance metrics (including materials, components, assemblies and systems) at the concept design stage. b. The building envelope performance requirements are included in the Basis of Design document and reflect the Owner's Project Requirements. c. The commissioning process includes envelope commissioning for air infiltration and leakage, which is reflected in the specification and commissioning plan. d. The envelope commissioning process is executed, as outlined in the commissioning plan. e. The envelope commissioning plan is included in the project Operation & Maintenance (O&M) Manual. WELL Core Guidance: Meet these requirements in the whole building. References 1. Klepeis NE, Nelson WC, Ott WR, et al. The National Human Activity Pattern Survey (NHAPS): A resource for assessing exposure to environmental pollutants. J Expo Anal Environ Epidemiol. 2001;11(3):231-252. doi:10.1038/sj.jea.7500165 2. Joshi S. The sick building syndrome. Indian J Occup Environ Med. 2008;12(2):61. doi:10.4103/0019-5278.43262 3. Selgrade MK, Plopper CG, Gilmour MI, Conolly RB, Foos BSP. Assessing the health effects and risks associated with children’s inhalation exposures - Asthma and allergy. J Toxicol Environ Heal - Part A Curr Issues. 2008;71(3):196-207. doi:10.1080/15287390701597897 4. U.S. Environmental Protection Agency. Indoor Air Pollution: An Introduction for Health Professionals. https://www.epa.gov/indoor-air-quality-iaq/indoor-air-pollution-introduction-health-professionals. 5. Jacobs DE, Kelly T, Sobolewski J. Linking public health, housing, and indoor environmental policy: Successes and challenges at local and federal agencies in the United States. Environ Health Perspect. 2007;115(6):976-982. doi:10.1289/ehp.8990 6. Cooperative Extension Service, University of Kentucky. Common Indoor Air Pollutants: Sources And Health Impacts. 2000. http://www2.ca.uky.edu/hes/fcs/factshts/HF-LRA.161.PDF. 7. U.S. Environmental Protection Agency. Volatile Organic Compounds’ Impact on Indoor Air Quality. https://www.epa.gov/indoor-air-quality-iaq/volatile-organic-compounds-impact-indoor-air-quality. 8. Wallace LA, Pellizzari E, Leaderer B, Zelon H, Sheldon L. Emissions of volatile organic compounds from building materials and consumer products. Atmos Environ. 1987;21(2):385-393. doi:10.1016/0004-6981(87)90017-5 9. Takaro TK, Krieger J, Song L, Sharify D, Beaudet N. The Breathe-Easy home: The impact of asthma-friendly home construction on clinical outcomes and trigger exposure. Am J Public Health. 2011;101(1):55-62. doi:10.2105/AJPH.2010.300008 10. Krieger J, Jacobs DE, Ashley PJ, et al. Housing interventions and control of asthma-related indoor biologic agents: a review of the evidence. J Public Health Manag Pract. 2010;16(5 Suppl):S11-S20. doi:10.1097/phh.0b013e3181fce56a 11. Health Ef

WELL Certification: 1 Pt | WELL Core: 2 Pt For All Spaces except Commercial Kitchen Spaces: Option 1: Appliance and heater combustion ban The following requirement is met: a. Combustion-based fireplaces, stoves, space heaters, ranges and ovens are not used in occupiable spaces.6 Option 2: Low-emission combustion sources Equipment used in the project for heating, cooling, water heating, process heating or power generation (including back-up, if used for more than 200 hours per year) within the building or project site meet some combination of the following requirements: a. Comply with California’s South Coast Air Quality Management District emission rules for pollution.7 b. Are electric. c. Are supplied by district heating or cooling. Option 3: Engine exhaust reduction The following requirement is met: a. Vehicle engine idling for more than 30 seconds is prohibited in all pick-up, drop-off and parking areas at the building site controlled by the project. "No idling" signage is present at these locations indicating this rule. WELL Core Guidance: Meet these requirements in the whole building. References 1. Klepeis NE, Nelson WC, Ott WR, et al. The National Human Activity Pattern Survey (NHAPS): A resource for assessing exposure to environmental pollutants. J Expo Anal Environ Epidemiol. 2001;11(3):231-252. doi:10.1038/sj.jea.7500165 2. Joshi S. The sick building syndrome. Indian J Occup Environ Med. 2008;12(2):61. doi:10.4103/0019-5278.43262 3. Selgrade MK, Plopper CG, Gilmour MI, Conolly RB, Foos BSP. Assessing the health effects and risks associated with children’s inhalation exposures - Asthma and allergy. J Toxicol Environ Heal - Part A Curr Issues. 2008;71(3):196-207. doi:10.1080/15287390701597897 4. U.S. Environmental Protection Agency. Indoor Air Pollution: An Introduction for Health Professionals. https://www.epa.gov/indoor-air-quality-iaq/indoor-air-pollution-introduction-health-professionals. 5. Jacobs DE, Kelly T, Sobolewski J. Linking public health, housing, and indoor environmental policy: Successes and challenges at local and federal agencies in the United States. Environ Health Perspect. 2007;115(6):976-982. doi:10.1289/ehp.8990 6. Cooperative Extension Service, University of Kentucky. Common Indoor Air Pollutants: Sources And Health Impacts. 2000. http://www2.ca.uky.edu/hes/fcs/factshts/HF-LRA.161.PDF. 7. U.S. Environmental Protection Agency. Volatile Organic Compounds’ Impact on Indoor Air Quality. https://www.epa.gov/indoor-air-quality-iaq/volatile-organic-compounds-impact-indoor-air-quality. 8. Wallace LA, Pellizzari E, Leaderer B, Zelon H, Sheldon L. Emissions of volatile organic compounds from building materials and consumer products. Atmos Environ. 1987;21(2):385-393. doi:10.1016/0004-6981(87)90017-5 9. Takaro TK, Krieger J, Song L, Sharify D, Beaudet N. The Breathe-Easy home: The impact of asthma-friendly home construction on clinical outcomes and trigger exposure. Am J Public Health. 2011;101(1):55-62. doi:10.2105/AJPH.2010.300008 10. Krieger J, Jacobs DE, Ashley PJ, et al. Housing interventions and

WELL Certification: 1 Pt | WELL Core: 0.5 Pt For All Spaces except Dwelling Units: For all bathrooms, kitchens, rooms for cleaning and chemical storage, rooms with high-volume printers and copiers and high-humidity areas, the following requirements are met: a. Meet one of the following: 1. Are separated from all adjacent regularly occupied spaces with self-closing doors and/or vestibules. 2. Are negatively pressurized compared with adjacent regularly occupied spaces. b. Utilize exhaust fans such that the return air is vented outdoors and not recirculated.9,10 For Commercial Kitchen Spaces: The following requirements are met: a. Canopy hoods have side or partial panels, when allowable by code.11 b. Type II hood overhangs and setbacks comply with ASHRAE 154-2011 (Table 3 - Minimum Overhang Requirements for Type II Hoods) on all open sides, measured in the horizontal plane from the inside edge of the hood to the edge of the top horizontal surface of the appliance.12 c. The vertical distance between the front lower lip of the hood and the cooking surface is less than or equal to 4 ft(1.2 m).12 d. Makeup air velocity near (or directed at) the hood is less than 75 fpm(0.38 m/s).11 e. Replacement air introduced directly into the exhaust hood cavity does not exceed 10% of the hood exhaust airflow rate.13 f. At least 50% of the air that replaces the exhaust air is conditioned transfer air, rather than makeup air.14 g. Appliances are grouped under exhaust hoods according to effluent production and associated ventilation requirements, as specified in ASHRAE 154-2011, per hood type (defined by the classifications used in ASHRAE 154-2011 for light, medium, heavy and extra-heavy appliance duty levels).12 h. Appliances have a rear seal between the appliance and the wall, when allowable by code.15 i. Appliances located at the end of a cook line requiring exhaust airflow rates greater than 300 cfm/ft(460 L/s/m) have a full side panel or an end wall.12 For Dwelling Units: For all ovens, cooking burners and stove top cooking appliances that use a range hood, the following requirements are met: a. Exhaust air is vented directly to the outdoors.16 b. Exhaust air outlets are separated from any air intakes by at least 10 ft(3 m), unless otherwise specified by local code.17 c. The minimum operating exhaust airflow rate is the greater of 100 cfm per linear foot(150 L/s per linear meter) of range hood width or 200 cfm(94 L/s).18 d. The range hood device, when in operation, covers at least 75% of the burner area.19 WELL Core Guidance: Meet these requirements in non-leased spaces. References 1. Klepeis NE, Nelson WC, Ott WR, et al. The National Human Activity Pattern Survey (NHAPS): A resource for assessing exposure to environmental pollutants. J Expo Anal Environ Epidemiol. 2001;11(3):231-252. doi:10.1038/sj.jea.7500165 2. Joshi S. The sick building syndrome. Indian J Occup Environ Med. 2008;12(2):61. doi:10.4103/0019-5278.43262 3. Selgrade MK, Plopper CG, Gilmour MI, Conolly RB, Foos BSP. Assessing the health effects and risk

WELL Certification: 1 Pt | WELL Core: 2 Pt For All Spaces: Option 1: Filtration levels The following requirement is met: a. Media filters are used in the ventilation system to filter outdoor air supplied to the space, in accordance with thresholds specified in the table below:5,6 Annual Average Outdoor PM 2.5Threshold Minimum Air Filtration Level (PM2.5 removal) 23 µg/m³ or less ≥80% (e.g., MERV 12 or M6) 24–39 µg/m³ ≥90% (e.g., MERV 14 or F8) 40 µg/m³ or greater ≥95% (e.g., MERV 16 or E10) Option 2: Filter maintenance The following requirement is met: a. Evidence that the filter has been replaced according to the manufacturer's recommendation is submitted annually through the WELL digital platform. WELL Core Guidance: Meet these requirements in the whole building. Up to 10% of the total area occupied by tenants can be excluded from the feature scope. References 1. Klepeis NE, Nelson WC, Ott WR, et al. The National Human Activity Pattern Survey (NHAPS): A resource for assessing exposure to environmental pollutants. J Expo Anal Environ Epidemiol. 2001;11(3):231-252. doi:10.1038/sj.jea.7500165 2. Joshi S. The sick building syndrome. Indian J Occup Environ Med. 2008;12(2):61. doi:10.4103/0019-5278.43262 3. Selgrade MK, Plopper CG, Gilmour MI, Conolly RB, Foos BSP. Assessing the health effects and risks associated with children’s inhalation exposures - Asthma and allergy. J Toxicol Environ Heal - Part A Curr Issues. 2008;71(3):196-207. doi:10.1080/15287390701597897 4. U.S. Environmental Protection Agency. Indoor Air Pollution: An Introduction for Health Professionals. https://www.epa.gov/indoor-air-quality-iaq/indoor-air-pollution-introduction-health-professionals. 5. Jacobs DE, Kelly T, Sobolewski J. Linking public health, housing, and indoor environmental policy: Successes and challenges at local and federal agencies in the United States. Environ Health Perspect. 2007;115(6):976-982. doi:10.1289/ehp.8990 6. Cooperative Extension Service, University of Kentucky. Common Indoor Air Pollutants: Sources And Health Impacts. 2000. http://www2.ca.uky.edu/hes/fcs/factshts/HF-LRA.161.PDF. 7. U.S. Environmental Protection Agency. Volatile Organic Compounds’ Impact on Indoor Air Quality. https://www.epa.gov/indoor-air-quality-iaq/volatile-organic-compounds-impact-indoor-air-quality. 8. Wallace LA, Pellizzari E, Leaderer B, Zelon H, Sheldon L. Emissions of volatile organic compounds from building materials and consumer products. Atmos Environ. 1987;21(2):385-393. doi:10.1016/0004-6981(87)90017-5 9. Takaro TK, Krieger J, Song L, Sharify D, Beaudet N. The Breathe-Easy home: The impact of asthma-friendly home construction on clinical outcomes and trigger exposure. Am J Public Health. 2011;101(1):55-62. doi:10.2105/AJPH.2010.300008 10. Krieger J, Jacobs DE, Ashley PJ, et al

WELL Certification: 1 Pt | WELL Core: 2 Pt For All Spaces: Option 1: Air supply requirements All occupiable spaces utilize one of the following strategies: a. 100% outdoor air (i.e., supply air has not recirculated from within the building). b. Partially recirculated air which has been treated with the following: 1. Activated carbon filter. 2. At least one of the following: (i) Media filter with PM2.5 removal of ≥90% (e.g., MERV 14 or F8), (ii) UVGI within the ducts to treat the moving air, or (iii) upper-room UVGI. c. Partially recirculated air and include air purification/cleaning devices within the space (with a quantity appropriate to the room volume or area, based on manufacturer specification) that include the following: 1. Activated carbon filter. 2. Media filter with PM2.5 removal of ≥90% (e.g., MERV 14 or F8) or UVGI. Option 2: Filter maintenance If filters or other air treatment is used, the following requirement is met: a. Evidence that the filter or device has been replaced or maintained according to the manufacturer's recommendation is submitted annually through the WELL digital platform. WELL Core Guidance: Meet these requirements in the whole building. Up to 10% of the total area occupied by tenants can be excluded from the feature scope. References 1. Klepeis NE, Nelson WC, Ott WR, et al. The National Human Activity Pattern Survey (NHAPS): A resource for assessing exposure to environmental pollutants. J Expo Anal Environ Epidemiol. 2001;11(3):231-252. doi:10.1038/sj.jea.7500165 2. Joshi S. The sick building syndrome. Indian J Occup Environ Med. 2008;12(2):61. doi:10.4103/0019-5278.43262 3. Selgrade MK, Plopper CG, Gilmour MI, Conolly RB, Foos BSP. Assessing the health effects and risks associated with children’s inhalation exposures - Asthma and allergy. J Toxicol Environ Heal - Part A Curr Issues. 2008;71(3):196-207. doi:10.1080/15287390701597897 4. U.S. Environmental Protection Agency. Indoor Air Pollution: An Introduction for Health Professionals. https://www.epa.gov/indoor-air-quality-iaq/indoor-air-pollution-introduction-health-professionals. 5. Jacobs DE, Kelly T, Sobolewski J. Linking public health, housing, and indoor environmental policy: Successes and challenges at local and federal agencies in the United States. Environ Health Perspect. 2007;115(6):976-982. doi:10.1289/ehp.8990 6. Cooperative Extension Service, University of Kentucky. Common Indoor Air Pollutants: Sources And Health Impacts. 2000. http://www2.ca.uky.edu/hes/fcs/factshts/HF-LRA.161.PDF. 7. U.S. Environmental Protection Agency. Volatile Organic Compounds’ Impact on Indoor Air Quality. https://www.epa.gov/indoor-air-quality-iaq/volatile-organic-compounds-impact-indoor-air-quality. 8. Wallace LA, Pellizzari E, Leaderer B, Zelon H, Sheldon L. Emissions of volatile organic compounds from building materials and consumer products. Atmos Environ. 1987;21(2):385-393. doi:10.1016/0004-6981(87)90017-5 9. Takaro TK, Krieger J, Song L, Sharify D, Beaudet N. The Breathe-Easy home: The impact of asth

WELL Certification: 1 Pt | WELL Core: 2 Pt For All Spaces: Option 1: UV system design The following requirements are met: a. All central air handling units use ultraviolet lamps to irradiate the surfaces of the cooling coils and drain pans.10 b. All cooling coils and drain pans associated with fan coil units either: 1. Are irradiated by ultraviolet lamps. 2. May be opened for inspection for mold growth and cleaned, if necessary. Option 2: UV system maintenance and inspection The following requirements are met: a. Evidence that the ultraviolet lamps have been replaced or maintained, according to manufacturer's recommendation is submitted annually through the WELL digital platform. b. All cooling coils without ultraviolet lamps (if applicable) are inspected on a quarterly basis for mold growth and cleaned. If necessary, dated photos demonstrating adherence are submitted annually through the WELL digital platform. WELL Core Guidance: Meet these requirements in the whole building. Up to 10% of the total area occupied by tenants can be excluded from the feature scope. References 1. Klepeis NE, Nelson WC, Ott WR, et al. The National Human Activity Pattern Survey (NHAPS): A resource for assessing exposure to environmental pollutants. J Expo Anal Environ Epidemiol. 2001;11(3):231-252. doi:10.1038/sj.jea.7500165 2. Joshi S. The sick building syndrome. Indian J Occup Environ Med. 2008;12(2):61. doi:10.4103/0019-5278.43262 3. Selgrade MK, Plopper CG, Gilmour MI, Conolly RB, Foos BSP. Assessing the health effects and risks associated with children’s inhalation exposures - Asthma and allergy. J Toxicol Environ Heal - Part A Curr Issues. 2008;71(3):196-207. doi:10.1080/15287390701597897 4. U.S. Environmental Protection Agency. Indoor Air Pollution: An Introduction for Health Professionals. https://www.epa.gov/indoor-air-quality-iaq/indoor-air-pollution-introduction-health-professionals. 5. Jacobs DE, Kelly T, Sobolewski J. Linking public health, housing, and indoor environmental policy: Successes and challenges at local and federal agencies in the United States. Environ Health Perspect. 2007;115(6):976-982. doi:10.1289/ehp.8990 6. Cooperative Extension Service, University of Kentucky. Common Indoor Air Pollutants: Sources And Health Impacts. 2000. http://www2.ca.uky.edu/hes/fcs/factshts/HF-LRA.161.PDF. 7. U.S. Environmental Protection Agency. Volatile Organic Compounds’ Impact on Indoor Air Quality. https://www.epa.gov/indoor-air-quality-iaq/volatile-organic-compounds-impact-indoor-air-quality. 8. Wallace LA, Pellizzari E, Leaderer B, Zelon H, Sheldon L. Emissions of volatile organic compounds from building materials and consumer products. Atmos Environ. 1987;21(2):385-393. doi:10.1016/0004-6981(87)90017-5 9. Takaro TK, Krieger J, Song L, Sharify D, Beaudet N. The Breathe-Easy home: The impact of asthma-friendly home construction on clinical outcomes and trigger exposure. Am J Public Health. 2011;101(1):55-62. doi:10.2105/AJPH.2010.300008 10. Krieger J, Jacobs DE, Ashley PJ, et al. Housing interventions