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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.

Monthly AQI Summary

Each cell shows the AQI value for that day, based on the 24-hour average concentration.  The far right column shows the highest daily AQI value for the month.

* 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 November, 2018 Monthly
Days 123456789101112131415161718192021222324252627282930 AQI
Napa - Napa Valley College
30
30
24
26
23
27
27
88
120
159
147
158
161
135
170
183
179
171
161
125
58
18
10
11
22
22
28
25
15
25
183
San Rafael
26
32
31
40
29
25
30
88
110
166
158
159
163
166
181
218
184
161
170
138
45
2
4
10
17
21
29
18
24
26
218
Sebastopol
6
13
2
5
12
4
22
163
226
209
156
168
172
131
153
168
160
149
152
133
52
4
5
11
14
20
24
15
15
16
226
Vallejo
37
45
51
38
27
155
72
160
165
171
165
157
186
247
186
166
169
158
103
19
17
23
42
48
40
38
26
25
247
Coast & Central Bay
Stations November, 2018 Monthly
Days 123456789101112131415161718192021222324252627282930 AQI
Berkeley Aquatic Park
37
34
57
54
53
87
162
178
163
165
158
164
198
216
176
153
166
154
50
23
22
28
43
52
39
34
42
32
216
Laney College
39
42
38
52
38
41
39
79
157
177
167
165
160
169
202
219
177
157
167
155
49
10
11
19
42
48
46
19
22
22
219
Oakland East
35
48
45
40
37
32
44
92
168
174
163
165
153
165
203
222
184
156
170
136
39
16
12
17
30
43
36
18
19
22
222
Oakland West
58
55
52
52
49
83
118
180
167
167
162
164
199
220
178
156
168
154
46
14
15
23
36
46
44
27
23
21
220
San Francisco - Arkansas St.
47
50
49
46
42
46
52
76
156
172
167
165
164
173
197
228
158
151
174
156
55
10
14
16
40
43
39
23
27
28
228
San Pablo - Rumrill
37
41
32
49
32
27
24
125
117
168
160
160
152
162
196
245
183
160
176
141
53
21
12
14
24
40
37
32
27
25
245
Eastern Zone
Stations November, 2018 Monthly
Days 123456789101112131415161718192021222324252627282930 AQI
Concord
20
25
22
21
11
18
22
73
76
167
159
159
133
152
184
230
210
176
173
157
89
9
4
8
17
30
22
20
8
14
230
Livermore - Rincon Ave.
18
32
24
21
23
14
18
56
161
160
154
162
138
186
193
223
191
176
156
153
76
7
3
11
23
38
35
18
8
16
223
Pleasanton - Owens Ct
32
40
30
38
37
26
30
63
158
165
157
160
151
165
193
215
191
173
162
156
83
7
5
9
17
37
32
16
8
16
215
South Central Bay
Stations November, 2018 Monthly
Days 123456789101112131415161718192021222324252627282930 AQI
Redwood City
32
48
30
40
31
31
44
61
165
169
152
159
142
157
185
183
159
153
154
125
37
14
8
13
32
46
40
26
12
30
185
Santa Clara Valley
Stations November, 2018 Monthly
Days 123456789101112131415161718192021222324252627282930 AQI
Gilroy
20
32
24
31
28
12
20
36
128
166
128
103
105
137
173
158
134
154
132
90
32
12
4
6
22
34
38
3
13
23
173
San Jose - Jackson St.
43
53
54
55
52
53
56
65
162
172
153
155
153
164
191
190
166
162
160
149
36
21
16
28
48
59
55
21
32
38
191
San Jose - Knox Av
27
42
40
45
39
42
46
57
161
172
153
154
146
160
186
194
169
162
159
150
26
12
8
21
41
52
49
8
87
34
194
Wood Burning Status
Wood Burning Status
  • Tuesday,
    3/19

    No Spare the Air Alert in Effect

  • Wednesday,
    3/20

    No Spare the Air Alert in Effect