How Will a Reduction in the Fine Particulate Matter National Ambient Air Quality Standard Impact My Facility?, 2023 PEERS Conference

On January 6, 2023, the United States Environmental Protection Agency (EPA) announced its proposed decision to revise the National Ambient Air Quality Standard (NAAQS) for fine particulate (PM2.5). EPA has established NAAQS for particulate matter (PM) that include both PM2.5 and PM10. EPA’s proposal is to lower the primary (health-based) annual NAAQS for PM2.5 from the current value of 12.0 µg/m3 to a value within the range of 9.0 to 10.0 µg/m3 while accepting comment on changing the annual standard levels to a range of 8.0 µg/m3 to 11.0 µg/m3. As part of this action, EPA proposed to retain the current secondary (welfare-based) annual PM2.5 NAAQS at 15.0 µg/m3, retain the current 24-hour primary and secondary PM2.5 NAAQS at a value of 35 µg/m3, and retain the primary and secondary PM10 NAAQS of 150 µg/m3 (24-hour average). EPA is also accepting comments on lowering the 24-hour PM2.5 NAAQS to 25 µg/m3.1

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