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.  

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.

AQI Key
Northern Zone
Stations Monday, December 11, 2017
Hourly PST 01234567891011121314151617181920212223
Napa
106
84
74
68
64
67
San Rafael
37
39
42
54
62
69
Sebastopol
75
66
65
65
68
63
Vallejo
81
79
78
77
73
72
Coast & Central Bay
Stations Monday, December 11, 2017
Hourly PST 01234567891011121314151617181920212223
Berkeley Aquatic Park
47
51
57
59
64
67
Laney College
69
69
67
68
72
76
Oakland East
45
46
53
53
56
71
Oakland West
61
68
70
75
74
76
San Francisco - Arkansas St.
52
59
59
73
76
88
San Pablo - Rumrill
58
58
58
65
65
69
Eastern Zone
Stations Monday, December 11, 2017
Hourly PST 01234567891011121314151617181920212223
Concord
55
52
53
52
45
50
Livermore - Rincon Ave.
86
76
67
64
62
58
South Central Bay
Stations Monday, December 11, 2017
Hourly PST 01234567891011121314151617181920212223
Redwood City
34
27
28
29
33
42
Santa Clara Valley
Stations Monday, December 11, 2017
Hourly PST 01234567891011121314151617181920212223
San Jose - Jackson St.
60
53
53
53
52
56
San Jose - Knox Av
86
77
76
71
66
65
Wood Burning Status
Wood Burning Status
  • illegal to burn

    Monday,
    12/11

    Winter Spare the Air Alert in Effect

10/17/2017