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, February 19, 2019
Hourly PST 01234567891011121314151617181920212223
Napa - Napa Valley College
28
25
17
15
13
11
14
San Rafael
19
15
12
8
6
7
10
Sebastopol
32
29
25
19
20
18
18
Vallejo
60
54
56
54
56
49
39
Coast & Central Bay
Stations Tuesday, February 19, 2019
Hourly PST 01234567891011121314151617181920212223
Berkeley Aquatic Park
50
44
38
32
22
24
28
Laney College
32
31
32
31
26
32
32
Oakland East
17
23
22
15
16
16
15
Oakland West
45
40
38
32
18
18
23
San Francisco - Arkansas St.
45
41
33
29
25
19
20
San Pablo - Rumrill
16
21
23
28
31
28
26
Eastern Zone
Stations Tuesday, February 19, 2019
Hourly PST 01234567891011121314151617181920212223
Concord
19
18
13
9
6
5
5
Livermore - Rincon Ave.
27
26
30
32
32
33
33
Pleasanton - Owens Ct
18
20
20
18
11
16
22
South Central Bay
Stations Tuesday, February 19, 2019
Hourly PST 01234567891011121314151617181920212223
Redwood City
18
18
13
11
14
15
16
Santa Clara Valley
Stations Tuesday, February 19, 2019
Hourly PST 01234567891011121314151617181920212223
Gilroy
35
30
25
23
20
14
11
San Jose - Jackson St.
48
45
41
41
33
27
38
San Jose - Knox Av
37
27
22
25
34
33
42
Wood Burning Status
Wood Burning Status
  • Tuesday,
    2/19

    No Spare the Air Alert in Effect