Note: All data are preliminary and subject to verification.

Air Quality Advisories

Particulate Matter Readings (PM2.5) & (PM10)

Particulate readings are elevated at times due to fire smoke. Levels of PM10 averaging higher than 150 micrograms per cubic meter (µg/m3) or levels of PM2.5 higher than 35 µg/m3 are considered unhealthy for sensitive groups.

*Ozone

Ozone levels are updated hourly at ten minutes past the hour, and are reported in parts per billion (ppb). Levels of ozone averaging higher than 70ppb are considered unhealthy for sensitive groups.

Times are in Pacific Time, and are for the start of the hour for the hourly average reported. For example, the ozone level reported for 10 AM represents the average of levels from 10 AM to 11 AM. Data are not considered final until verified by the APCD.

Location of Monitoring Stations

Click on the map for a larger image and location of ambient air quality monitoring stations.