WELL™ v2 defines the following air quality sensor requirements:
a. The project deploys monitors that measure at least three of the following parameters:
- PM2.5 or PM10 (accuracy 25% at 50 μg/m3).
- Carbon dioxide (accuracy 10% at 750 ppm).
- Carbon monoxide (accuracy 1 ppm at values between 0 and 10 ppm).
- Ozone (accuracy 10 ppb at values between 0 and 100 ppb).
- Nitrogen dioxide (accuracy 20 ppb at values between 0 and 100 ppb).
- Total VOCs (accuracy 25% at 500 μg/m3).
- 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.
c. Measurements are taken at intervals of no longer than 10 minutes for carbon dioxide and no longer than one hour for other pollutants.
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