Air Monitoring Data

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Maintenance Notice:
Hourly measurement values for all stations may be unavailable from 5am to 7pm on Saturday 6/15.

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 
San Pablo - Rumrill
Parameters Sunday, November 11, 2018 Daily
Hourly PST 01234567891011121314151617181920212223 AQI
Fine Particulate Matter (PM2.5)
183
183
183
183
177
163
155
131
117
104
112
144
156
166
156
153
152
156
158
159
162
163
161
161
160
Spare the Air Status
Spare the Air Status
  • Monday,
    6/17

    No Spare the Air Alert in Effect