Air Monitoring Data

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This page provides access to current and historical air quality and meteorological information based on measurements taken at stations in the Air District’s air monitoring network. Some of the data on these pages is raw or unchecked data that may contain errors.

Measurement: PM2.5

PM2.5 is a term for fine particulate matter pollution.  PM2.5 is primarily a problem in the wintertime in the Bay Area, when wood burning constitutes the major source.

Daily AQI Measurements

Each cell in this chart shows the estimated hourly Air Quality Index (AQI) values for PM2.5.  View AQI flyer.

As established by the U.S. EPA, the AQI for PM2.5 is based on 24-hour concentrations, so hourly readings are only estimates.  

The column at far right shows the preliminary AQI value for the day, based on the 24-hour average concentration.

If the number in the far right column is greater than 100, it means that PM2.5 levels were over the federal health standard.  Values between 101 and 150 in the far right column mean that air quality was in the Unhealthy for Sensitive Groups category for the day.  If the value in the far right column is greater than 150, that means air quality was in the Unhealthy category.

* At this time, PM2.5 measurements at the Napa Valley College location are for informational purposes only.

Refresh this page to view the current day.


AQI Key 
Northern Zone
Stations Monday, December 17, 2018
Hourly PST 01234567891011121314151617181920212223
Napa - Napa Valley College
1
San Rafael
7
Sebastopol
12
Vallejo
15
Coast & Central Bay
Stations Monday, December 17, 2018
Hourly PST 01234567891011121314151617181920212223
Berkeley Aquatic Park
13
Laney College
12
Oakland East
12
Oakland West
18
San Francisco - Arkansas St.
19
San Pablo - Rumrill
15
Eastern Zone
Stations Monday, December 17, 2018
Hourly PST 01234567891011121314151617181920212223
Concord
0
Livermore - Rincon Ave.
20
Pleasanton - Owens Ct
1
South Central Bay
Stations Monday, December 17, 2018
Hourly PST 01234567891011121314151617181920212223
Redwood City
16
Santa Clara Valley
Stations Monday, December 17, 2018
Hourly PST 01234567891011121314151617181920212223
Gilroy
6
San Jose - Jackson St.
13
San Jose - Knox Av
0
Wood Burning Status
Wood Burning Status
  • Monday,
    12/17

    No Spare the Air Alert in Effect