Concentration Chart

This chart shows hourly concentrations of each ambient pollutant. Select a parameter, date, time frame and view one or multiple sites. Sites with a gray box do not have data available for the selected pollutant.

Ozone monitoring has concluded for 2018 and will resume on March 1, 2019. Only the Taft site will display a chart for ozone.

Please wait while page loads. Data not quality assured. For National Ambient Air Quality Standards, click here. For more information or to obtain historical data, please contact us.