Sections: Understanding Air Quality Data

Access to current and historical air quality and meteorological information based on measurements taken at stations in the Air District’s air quality data network.

Local Bay Area air quality alerts and information on how to reduce air pollution.

Answers to common air quality questions from the Air District.

Help understanding why different sites show different readings and where to access the most accurate data.

U.S. real-time, local air quality index data.

Air Data website with recent and historical data collected at outdoor monitors across the US.

Daily and hourly data from state-run air quality monitoring sites in California,

Country-wide map of air sensors and reference instruments measuring PM2.5 showing current air quality conditions, wildfires, and smoke plumes.

PurpleAir air quality sensor data and downloads on a global map. Not calibrated.

Clarity Movement’s air quality sensor map, showing real-time readings. Internally calibrated.