This is a legacy version of the WELL Building Standard. Please check the latest version here.
   
  1. Air
  2. Air quality standards

Air quality standards

Features/Air/Feature 01

Air quality standards

Intent: 

To ensure a basic level of high indoor air quality.

01: Air quality standards
    Post Date: 27 May, 2020
    Status: Approved

    To utilize the following AAP, projects must meet the following requirements:
    - The project is located in a country listed in the "lower-middle" or "low" income groups as per the 2016 analysis according to the World Bank Atlas Method.
    - The project achieves certification under a qualifying pre-approved green building program.
    - The project achieves Feature 18.

    Projects that meet the requirements above may use the following thresholds in lieu of those listed in Part 2:
    - PM₂.₅ less than 35 μg/m³
    - PM₁₀ less than 75 μg/m³.

    A project using this AAP is limited to Silver level certification.
    Post Date: 27 Apr, 2017
    Status: Approved

    Updated:
    Projects may exceed 500 µg/m³ in total VOCs (part 1b), so long as the following individual component VOCs do not exceed the limits listed in CDPH/EHLB/Standard Method V1.1, Table 4.1 (one half the Chronic Reference Exposure Levels (CREL) issued by Office of Environmental Health Hazard Assessment):

    Compound Name CAS No. Allowable Conc (µg/m³)
    Benzene 71-43-2 30
    Carbon disulfide 75-15-0 400
    Carbon tetrachloride 56-23-5 20
    Chlorobenzene 108-90-7 500
    Chloroform 67-66-3 150
    Dichlorobenzene (1,4-) 106-46-7 400
    Dichloroethylene (1,1) 75-35-4 35
    Ethylbenzene 100-41-4 1000
    Hexane (n-) 110-54-3 3500
    Isopropyl Alcohol 67-63-0 3500
    Methyl chloroform 71-55-6 500
    Methylene chloride 75-09-2 200
    Methyl tert-butyl ether 1634-04-4 4000
    Styrene 100-42-5 450
    Tetrachloroethene 127-18-4 17.5
    Toluene 108-88-3 150
    Trichloroethylene 79-01-6 300
    Vinyl acetate 108-05-4 100
    Xylene (m, o, p combined) 108-38-3 + 95-47-6 + 106-42-3, 179601-23-1 + 95-47-6, or 1330-20-7 350
    Post Date: 09 Feb, 2017
    Status: Approved

    Projects located in areas where annual average ambient PM2.5 levels are 35 µg/m³ or higher may utilize one of the following alternative strategies to satisfy Part 2.
    - Replace the PM2.5 level in part 2b with 25 µg/m³. Projects using this option are limited in WELL Certification level to Gold, no matter how many optimizations are achieved.
    - Replace the PM2.5 level in part 2b and the PM10 level in part 2c with a level equal to 30% of the 24- or 48-hr average of ambient outdoor levels on the day(s) of Performance Verification. Projects using this option are limited in WELL Certification level to Silver, no matter how many optimizations are achieved.