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 Friday, April 26, 2019
Hourly PST 01234567891011121314151617181920212223
Napa - Napa Valley College
22
25
27
30
30
23
22
San Rafael
29
29
29
29
25
25
33
Sebastopol
34
27
24
25
29
29
21
Vallejo
49
51
55
56
56
57
56
Coast & Central Bay
Stations Friday, April 26, 2019
Hourly PST 01234567891011121314151617181920212223
Berkeley Aquatic Park
60
58
60
61
59
59
59
Laney College
52
50
48
50
51
52
52
Oakland East
37
33
43
44
41
43
41
Oakland West
53
56
55
55
57
56
56
San Francisco - Arkansas St.
58
55
55
55
53
51
54
San Pablo - Rumrill
54
56
57
54
49
46
50
Eastern Zone
Stations Friday, April 26, 2019
Hourly PST 01234567891011121314151617181920212223
Concord
40
42
45
49
43
39
52
Livermore - Rincon Ave.
42
42
40
38
38
32
30
South Central Bay
Stations Friday, April 26, 2019
Hourly PST 01234567891011121314151617181920212223
Redwood City
55
48
61
39
24
64
62
Santa Clara Valley
Stations Friday, April 26, 2019
Hourly PST 01234567891011121314151617181920212223
Gilroy
16
20
27
30
27
24
22
San Jose - Jackson St.
53
55
55
54
52
42
54
San Jose - Knox Av
44
45
45
44
54
48
40
Wood Burning Status
Wood Burning Status
  • Friday,
    4/26

    No Spare the Air Alert in Effect