Air Monitoring Data

Filters
Filters
Close
  • Displays
    Daily |  Monthly |  Yearly
  • Historical Data
  • View
  • Measurement
  • Stations

Maintenance Notice:
Hourly measurement values for all stations may be unavailable from 5am to 7pm on Saturday 6/15.

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: Fine Particulate Matter (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.

Yearly AQI Summary

Each cell shows the highest daily AQI value for that month.  The far right column shows the highest daily AQI value for the entire year.

Refresh this page to view the current day.


AQI Key 
Northern Zone
Stations 2018 Yearly
Months 123456789101112 AQI
Napa
89
64
52
62
49
89
Napa - Napa Valley College
82
54
38
57
60
52
55
79
55
54
183
68
183
Pleasanton - Owens Ct
0
56
62
59
57
123
67
67
215
63
215
San Rafael
123
62
38
57
61
52
59
98
58
57
218
83
218
Sebastopol
84
56
32
46
57
45
51
65
48
30
226
60
226
Vallejo
132
74
51
63
64
53
59
92
60
57
247
74
247
Coast & Central Bay
Stations 2018 Yearly
Months 123456789101112 AQI
Berkeley Aquatic Park
93
83
53
64
68
85
54
118
59
58
216
76
216
Laney College
108
84
64
66
70
61
58
133
69
60
219
69
219
Oakland East
89
66
56
63
65
56
56
117
70
62
222
63
222
Oakland West
101
95
64
67
73
72
54
125
76
70
220
79
220
San Francisco - Arkansas St.
111
82
55
54
58
56
58
128
70
63
228
89
228
San Pablo - Rumrill
104
65
47
66
70
63
63
116
64
60
245
80
245
Eastern Zone
Stations 2018 Yearly
Months 123456789101112 AQI
Concord
145
81
54
60
59
62
62
110
58
75
210
63
210
Livermore - Rincon Ave.
110
58
47
56
53
46
52
114
64
58
223
63
223
South Central Bay
Stations 2018 Yearly
Months 123456789101112 AQI
Redwood City
83
58
38
59
62
56
57
122
56
55
185
65
185
Santa Clara Valley
Stations 2018 Yearly
Months 123456789101112 AQI
Gilroy
61
33
28
42
48
45
48
113
53
56
173
67
173
San Jose - Jackson St.
107
64
56
64
64
56
56
125
71
68
191
76
191
San Jose - Knox Av
124
75
54
63
63
76
53
108
60
67
194
84
194
Spare the Air Status
Spare the Air Status
  • Monday,
    6/17

    No Spare the Air Alert in Effect