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 Saturday, February 16, 2019
Hourly PST 01234567891011121314151617181920212223
Napa - Napa Valley College
10
11
16
20
19
9
2
1
5
7
8
12
San Rafael
15
11
10
3
0
0
1
7
12
16
17
12
Sebastopol
1
2
12
14
9
2
1
0
5
8
10
12
Vallejo
20
22
20
18
15
14
18
23
26
25
23
20
Coast & Central Bay
Stations Saturday, February 16, 2019
Hourly PST 01234567891011121314151617181920212223
Berkeley Aquatic Park
23
18
19
20
16
21
27
24
18
22
30
33
Laney College
19
14
13
17
15
14
17
19
20
18
20
18
Oakland East
17
17
12
6
5
7
10
13
21
21
23
28
Oakland West
27
24
22
22
19
18
13
11
10
7
10
13
San Francisco - Arkansas St.
22
26
25
21
21
21
25
21
23
24
35
32
San Pablo - Rumrill
26
19
14
17
15
14
11
16
16
17
21
25
Eastern Zone
Stations Saturday, February 16, 2019
Hourly PST 01234567891011121314151617181920212223
Concord
5
8
15
14
5
0
2
1
7
10
13
13
Livermore - Rincon Ave.
58
35
58
30
18
13
61
42
27
18
Pleasanton - Owens Ct
21
21
19
14
19
18
11
12
12
10
7
10
South Central Bay
Stations Saturday, February 16, 2019
Hourly PST 01234567891011121314151617181920212223
Redwood City
13
11
16
16
10
9
7
5
5
7
10
17
Santa Clara Valley
Stations Saturday, February 16, 2019
Hourly PST 01234567891011121314151617181920212223
Gilroy
28
25
23
22
25
30
27
24
27
28
28
22
San Jose - Jackson St.
19
26
30
21
27
30
25
30
27
49
41
33
San Jose - Knox Av
19
16
18
18
17
19
20
22
22
17
15
22
Wood Burning Status
Wood Burning Status
  • Saturday,
    2/16

    No Spare the Air Alert in Effect