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.  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 Tuesday, November 13, 2018 Daily
Hourly PST 01234567891011121314151617181920212223 AQI
Napa - Napa Valley College
171
172
170
170
165
162
163
163
163
163
162
159
156
155
154
152
154
157
161
164
163
161
159
156
161
San Rafael
155
157
159
162
165
166
167
168
168
166
163
164
163
164
164
164
164
164
164
164
163
162
161
160
163
Sebastopol
199
198
196
196
191
188
187
185
181
179
174
171
167
164
163
162
161
161
161
160
160
160
161
161
172
Vallejo
157
156
157
158
158
158
159
158
157
158
160
165
169
173
175
181
179
173
167
166
166
167
167
167
165
Coast & Central Bay
Stations Tuesday, November 13, 2018 Daily
Hourly PST 01234567891011121314151617181920212223 AQI
Berkeley Aquatic Park
151
151
145
146
151
153
154
154
155
156
157
158
159
159
158
161
162
163
165
165
164
164
162
161
158
Laney College
141
146
152
152
154
155
155
155
160
163
164
162
162
160
160
162
163
166
167
167
167
163
163
160
160
Oakland East
153
153
152
152
146
152
151
152
154
155
158
158
155
156
157
156
157
155
152
143
147
151
140
137
153
Oakland West
163
162
160
158
156
155
155
157
158
159
160
161
162
160
160
160
164
165
166
167
168
167
167
165
162
San Francisco - Arkansas St.
167
168
169
170
170
170
170
169
169
168
167
167
163
154
151
150
156
160
164
166
166
165
163
161
164
San Pablo - Rumrill
155
161
156
141
120
111
108
141
154
157
157
152
155
152
155
154
152
Eastern Zone
Stations Tuesday, November 13, 2018 Daily
Hourly PST 01234567891011121314151617181920212223 AQI
Concord
132
132
131
132
130
129
128
130
134
144
152
153
153
152
143
130
125
125
125
126
121
122
117
116
133
Livermore - Rincon Ave.
157
156
153
152
153
143
135
132
137
137
137
136
138
139
136
132
128
129
131
130
136
139
137
134
138
Pleasanton - Owens Ct
156
155
155
154
154
153
152
152
152
153
152
153
153
153
153
153
152
152
152
149
148
145
139
136
151
South Central Bay
Stations Tuesday, November 13, 2018 Daily
Hourly PST 01234567891011121314151617181920212223 AQI
Redwood City
136
114
105
99
99
94
89
92
107
138
152
154
155
155
159
158
159
156
159
158
155
153
147
133
142
Santa Clara Valley
Stations Tuesday, November 13, 2018 Daily
Hourly PST 01234567891011121314151617181920212223 AQI
Gilroy
104
107
107
108
108
107
106
112
109
110
111
112
111
107
107
111
113
114
112
96
91
90
85
89
105
San Jose - Jackson St.
156
156
155
153
147
137
144
140
129
133
132
136
145
148
151
152
153
155
157
161
161
161
159
157
153
San Jose - Knox Av
159
159
157
155
152
143
130
122
125
125
121
131
139
136
139
139
139
152
154
155
153
151
140
144
146
Spare the Air Status
Spare the Air Status
  • Sunday,
    5/19

    No Spare the Air Alert in Effect

  • Monday,
    5/20

    No Spare the Air Alert in Effect