California Air Resources Board

Demonstrations of the impacts of exceptional events have been compiled by CARB and by individual air quality management districts (AQMD) and air pollution control districts (APCD).  Several examples are given below. 

Air Districts

Feather River AQMD

• 2020 and 2021 wildfire smoke impacts on PM2.5 monitors in Yuba City-Marysville Planning Area (District website)

Great Basin Unified APCD

• 2020 wildfire smoke impacts on PM10 monitors in Mammoth Lakes Planning Area (pdf on District website)

Imperial County APCD

• 2019 high wind dust impacts on PM10 monitors in Imperial Valley Planning Area (District website)

Mariposa County APCD

• 2021 and 2022 wildfire smoke impacts on ozone monitors in Mariposa County (District website)

Northern Sierra AQMD

• 2021 prescribed fire impacts on Grass Valley PM2.5 monitor in Nevada County (EPA website) 

Sacramento Metro APCD

• 2018 wildfire smoke impacts on PM10 monitors in Sacramento County (pdf on District website)

San Joaquin Valley APCD

• 2020 wildfire smoke impacts on PM2.5 monitors in the San Joaquin Valley (District website)

South Coast AQMD

• 2023 wildfire smoke impacts on Palm Springs ozone monitor in Coachella Valley (pdf on District website)

California Air Resources Board

2018 Ozone Exceptional Events

Southern Region

• CARB Demonstration (No public comments received prior to October 4, 2021 deadline)
• CARB Final Transmittal Letter

Northern Region

• CARB Demonstration (No public comments received prior to October 18, 2021 deadline)
• CARB Final Transmittal Letter
• Tuscan Buttes Q/D Addendum
  • Attachment A

2020 Ozone Exceptional Events

Southern Region

• CARB Demonstration (No public comments received prior to January 10, 2022 deadline)
• CARB Final Transmittal Letter 

Northern Region

• CARB Demonstration (No public comments received prior to December 20, 2021 deadline)
• CARB Final Transmittal Letter