Historical Air Quality Data

Download South Coast AQMD’s Historical Air Quality Concentration Data 

Historical Air Quality by Year 

Historical Ozone Exceedance Trends (1980-Present) 

Historical Ozone Design Value Trends (1982-Present)

California Air Resources Board (External sites)
Current and historic data for the South Coast area and the entire state of California 
Latest ozone summary 

United States Environmental Protection Agency’s Air Data (External site)
Download data from the Air Quality System


Related information:

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Please visit for current hydrogen sulfide (H2S) monitored values in the Salton Sea area or to sign-up for H2S alerts. 

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South Coast Air Quality Management District

21865 Copley Dr, Diamond Bar, CA 91765



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