Effective May 2024, EPA tightened the annual health-based National Ambient Air Quality Standard (NAAQS) for fine particulate matter (PM2.5) from 12.0 µg/m3 to 9.0 µg/m3. This change was made after a review of the available...more
The Alabama Department of Environmental Management’s Air Division recently issued a revised version of its long-standing guidance document “Emissions Test Protocol and Test Report Requirements.”...more