Air Monitoring Data

Filters
Filters
Close
  • Displays
    Daily |  Monthly |  Yearly
  • Historical Data
    RadDatePicker
    RadDatePicker
    Open the calendar popup.
  • View
  • Measurement
  • Stations

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 Wednesday, November 14, 2018 Daily
Hourly PST 01234567891011121314151617181920212223 AQI
Napa - Napa Valley College
152
137
122
117
108
105
102
107
101
101
102
112
131
151
153
155
155
156
154
152
151
142
150
152
135
San Rafael
159
158
157
158
158
158
158
159
161
161
162
163
163
163
164
167
168
171
177
185
182
175
172
168
166
Sebastopol
162
161
161
159
158
158
156
156
155
142
122
115
111
112
124
124
102
103
96
94
96
96
91
89
131
Vallejo
167
167
167
166
165
163
162
160
160
157
156
154
153
153
152
153
153
153
154
155
155
156
155
155
157
Coast & Central Bay
Stations Wednesday, November 14, 2018 Daily
Hourly PST 01234567891011121314151617181920212223 AQI
Berkeley Aquatic Park
158
154
152
146
134
139
145
154
157
162
168
163
161
161
164
162
166
166
166
167
175
181
186
189
164
Laney College
153
154
148
140
144
147
152
154
156
159
162
168
170
169
169
167
167
168
171
178
192
198
200
197
169
Oakland East
132
130
123
126
128
130
134
142
142
154
156
156
161
170
172
172
170
170
174
177
183
187
190
190
165
Oakland West
164
162
157
153
146
143
151
154
157
158
158
161
160
158
159
160
163
169
171
173
175
177
182
189
164
San Francisco - Arkansas St.
162
164
163
164
164
164
162
160
159
159
162
165
179
176
171
172
178
180
182
188
187
188
191
187
173
San Pablo - Rumrill
140
132
141
135
143
145
153
154
153
153
150
146
154
160
159
158
158
159
167
178
187
189
189
186
162
Eastern Zone
Stations Wednesday, November 14, 2018 Daily
Hourly PST 01234567891011121314151617181920212223 AQI
Concord
115
113
109
107
101
99
99
100
107
106
133
136
154
159
162
159
154
153
157
159
161
163
162
164
152
Livermore - Rincon Ave.
134
134
130
120
119
113
111
112
112
112
156
192
195
229
254
269
272
251
242
240
232
226
219
209
186
Pleasanton - Owens Ct
135
132
124
122
123
122
122
122
123
111
111
155
178
188
209
187
177
173
172
170
173
179
186
189
165
South Central Bay
Stations Wednesday, November 14, 2018 Daily
Hourly PST 01234567891011121314151617181920212223 AQI
Redwood City
111
100
100
89
91
87
85
88
98
114
131
153
160
160
160
162
178
185
190
188
182
173
167
161
157
Santa Clara Valley
Stations Wednesday, November 14, 2018 Daily
Hourly PST 01234567891011121314151617181920212223 AQI
Gilroy
91
93
97
92
89
87
88
88
88
103
108
110
104
99
95
99
137
160
164
158
160
163
166
169
137
San Jose - Jackson St.
154
152
152
142
137
127
128
135
135
152
154
155
155
157
161
169
171
174
181
184
187
188
189
187
164
San Jose - Knox Av
143
144
134
134
134
138
140
144
153
154
155
156
156
155
157
163
168
169
170
174
174
173
173
175
160
Wood Burning Status
Wood Burning Status
  • Thursday,
    2/21

    No Spare the Air Alert in Effect