Monitoring Station Summary

Monitoring Station Data

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 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.

air pollution control district logo

New Phone Numbers
The District has new direct lines for all staff, as well as for all of our phone lines, including our main phone number and Complaints line. You can find our new phone numbers on this webpage.

Nuevos números de teléfono
El Distrito tiene nuevos números de teléfono para comunicarse con el personal directamente, así como también para todas nuestras líneas telefónicas, incluyendo nuestro número principal y el de las Quejas. Puede encontrar nuestros nuevos números de teléfono en esta página web.