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 Tuesday, April 23, 2019
Hourly PST 01234567891011121314151617181920212223
Napa - Napa Valley College
29
San Rafael
37
37
Sebastopol
27
Vallejo
54
52
Coast & Central Bay
Stations Tuesday, April 23, 2019
Hourly PST 01234567891011121314151617181920212223
Berkeley Aquatic Park
60
Laney College
56
55
Oakland East
32
29
Oakland West
59
59
San Francisco - Arkansas St.
57
60
San Pablo - Rumrill
59
Eastern Zone
Stations Tuesday, April 23, 2019
Hourly PST 01234567891011121314151617181920212223
Concord
32
Livermore - Rincon Ave.
25
27
Pleasanton - Owens Ct
32
33
South Central Bay
Stations Tuesday, April 23, 2019
Hourly PST 01234567891011121314151617181920212223
Redwood City
34
23
Santa Clara Valley
Stations Tuesday, April 23, 2019
Hourly PST 01234567891011121314151617181920212223
Gilroy
12
6
San Jose - Jackson St.
66
66
San Jose - Knox Av
41
33
Wood Burning Status
Wood Burning Status
  • Tuesday,
    4/23

    No Spare the Air Alert in Effect