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State Implementation Plans

Air Quality Attainment Plans

 CountyDesignation, Attainment Standard
 Western Nevada CountySerious, August 3, 2026Ozone, 2015 NAAQS 8-hour Std of 0.070 ppm
 Western Nevada CountyModerate, July 20, 2018Ozone, 2008 NAAQS 8-hour Std of 0.075 ppm
Plumas County - PortolaTBD2024 NAAQS 24-hour std of 9.0 μg/m3
 Plumas County - PortolaSerious, December 31, 20252017 NAAQS 24-hour std of 12.0 μg/m3
Plumas County - PortolaModerate,  December 21. 20212012 NAAQS 24-hour std of 12.0 μg/m3

Planning Documents and Notes 

Plumas County – Portola 

Resources

CARB Ambient Air Quality Standards Designation Tool

CARB Maps of State and Federal Area Designations

CARB - Northern Sierra AQMD Air Quality Plans

EPA California Nonattainment/Maintenance Status for Each County by Year for All Criteria Pollutants

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