Air Quality Advisory

Air Quality Advisory through Friday, November 16, due to heavy wildfire smoke impacts in parts of the Bay Area from the Camp Fire in Butte County. See our Wildfire Safety Tips web page.

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.  

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.

AQI Key 
Northern Zone
Stations Wednesday, November 14, 2018
Hourly PST 01234567891011121314151617181920212223
Napa - Napa Valley College
148
133
120
116
108
105
102
107
101
103
103
112
131
San Rafael
158
158
157
157
157
158
158
159
161
162
163
163
163
Sebastopol
163
162
162
160
159
158
156
156
154
142
122
115
111
Vallejo
167
167
167
166
165
163
162
160
160
158
156
154
153
Coast & Central Bay
Stations Wednesday, November 14, 2018
Hourly PST 01234567891011121314151617181920212223
Berkeley Aquatic Park
158
154
152
146
134
139
145
154
157
162
168
163
161
Laney College
153
154
148
140
144
147
152
154
156
159
162
168
170
Oakland East
129
128
122
125
127
130
134
142
152
156
157
157
161
Oakland West
163
161
157
153
146
143
151
154
157
158
158
161
160
San Francisco - Arkansas St.
162
164
163
163
164
164
162
160
159
157
161
164
179
San Pablo - Rumrill
140
132
141
135
143
145
153
154
153
148
143
141
153
Eastern Zone
Stations Wednesday, November 14, 2018
Hourly PST 01234567891011121314151617181920212223
Concord
114
112
108
106
101
99
99
101
107
109
134
136
154
Livermore - Rincon Ave.
134
134
130
120
119
113
112
112
116
115
156
192
195
Pleasanton - Owens Ct
134
132
124
121
123
122
122
122
123
111
117
156
179
South Central Bay
Stations Wednesday, November 14, 2018
Hourly PST 01234567891011121314151617181920212223
Redwood City
111
100
100
89
91
87
85
88
98
114
131
153
160
158
Santa Clara Valley
Stations Wednesday, November 14, 2018
Hourly PST 01234567891011121314151617181920212223
Gilroy
92
94
97
93
89
87
89
88
98
111
112
112
105
San Jose - Jackson St.
153
149
151
141
137
127
128
135
147
153
155
155
156
San Jose - Knox Av
135
138
131
132
133
137
139
143
152
154
155
156
156
Wood Burning Status
Wood Burning Status
  • illegal to burn

    Wednesday,
    11/14

    Winter Spare the Air Alert in Effect

  • illegal to burn

    Thursday,
    11/15

    Winter Spare the Air Alert in Effect