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: 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.

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.

Refresh this page to view the current day.


AQI Key 
Northern Zone
Stations Monday, November 12, 2018 Daily
Hourly PST 01234567891011121314151617181920212223 AQI
Napa - Napa Valley College
128
121
112
115
102
107
106
104
107
110
134
154
155
162
169
171
172
179
181
178
170
168
166
166
158
Pleasanton - Owens Ct
168
168
167
168
169
168
166
166
166
166
165
164
163
157
157
155
155
155
155
156
157
157
156
155
160
San Rafael
152
152
153
153
154
152
148
151
155
162
155
158
166
171
174
175
174
170
165
161
158
156
154
153
159
Sebastopol
153
141
141
135
132
134
136
145
143
141
136
151
154
156
157
164
180
187
194
195
202
202
198
198
168
Vallejo
183
182
173
158
176
183
193
184
177
177
169
165
164
175
176
176
169
166
165
164
165
164
164
162
171
Coast & Central Bay
Stations Monday, November 12, 2018 Daily
Hourly PST 01234567891011121314151617181920212223 AQI
Berkeley Aquatic Park
159
160
160
162
162
167
165
166
169
167
166
166
166
166
167
169
170
170
170
169
163
160
155
154
165
Laney College
162
162
163
163
164
166
166
169
170
171
171
170
170
170
169
168
169
169
169
167
160
155
152
152
165
Oakland East
166
165
164
164
165
165
167
174
175
175
172
169
167
166
166
167
165
167
163
161
160
157
154
153
165
Oakland West
162
163
163
163
163
164
166
167
169
169
169
168
168
167
166
166
168
170
170
171
172
171
169
165
167
San Francisco - Arkansas St.
171
170
167
165
165
164
163
164
164
164
163
164
164
163
163
162
163
164
165
166
167
168
168
167
165
San Pablo - Rumrill
161
160
161
160
162
174
178
176
170
162
161
162
164
164
159
154
154
152
147
149
145
142
152
160
Eastern Zone
Stations Monday, November 12, 2018 Daily
Hourly PST 01234567891011121314151617181920212223 AQI
Concord
161
161
161
161
161
161
161
161
162
174
176
177
175
172
165
155
146
133
134
128
130
137
133
133
159
Livermore - Rincon Ave.
159
162
169
171
170
169
167
165
165
162
166
166
162
161
160
157
157
157
161
162
163
162
159
158
162
South Central Bay
Stations Monday, November 12, 2018 Daily
Hourly PST 01234567891011121314151617181920212223 AQI
Redwood City
145
146
148
152
154
156
159
158
160
162
164
168
167
166
165
164
164
164
164
163
158
154
135
159
Santa Clara Valley
Stations Monday, November 12, 2018 Daily
Hourly PST 01234567891011121314151617181920212223 AQI
Gilroy
102
111
104
106
94
96
106
107
115
116
121
124
120
108
105
106
105
96
94
83
80
81
91
100
103
San Jose - Jackson St.
151
138
140
141
126
123
120
114
118
124
126
134
137
141
153
156
161
166
170
172
171
169
165
160
155
San Jose - Knox Av
160
160
159
156
154
148
137
136
128
117
110
105
115
124
143
151
158
166
169
170
164
161
162
160
154
Spare the Air Status
Spare the Air Status
  • Monday,
    6/24

    No Spare the Air Alert in Effect