According to the National Stone, Sand & Gravel Association (NSSGA), on Dec. 7, the Environmental Protection Agency (EPA) finalized the National Ambient Air Quality Standard (NAAQS) for Particulate Matter (PM), retaining the current standard for both coarse PM (PM10) and fine PM (PM2.5).
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EPA to Retain Ambient Air Quality Standards
The U.S. Environmental Protection Agency (EPA) announced a proposal to retain, without changes, the National Ambient Air Quality Standards (NAAQS) for particulate matter (PM) including both fine particles (PM2.5) and coarse particles (PM10).
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