Understanding PurpleAir vs. AirNow.gov Measurements of Smoke Pollution
An explanation of why you’re seeing two different numbers
Published in
9 min readAug 21, 2020
You may have noticed PurpleAir and AirNow.gov giving different Air Quality Index (AQI) values for your zip code. For example, on August 21st, when I checked these sites, the AQI given on AirNow.gov for the 94720 zip code of Berkeley was 107. By…
