EPA Sets Implementation Timeline For Newly Strengthened PM2.5 NAAQS

EPA is laying out its timetable for states and the agency to implement its tightened national ambient air quality standards (NAAQS) for fine particulate matter (PM2.5), with the first designations of areas of the country as meeting or violating the limit targeted for 2026 and compliance deadlines beginning six years later in 2032. States will have until Feb. 7, 2025, to designate areas as attaining the new annual limit of 9 micrograms per cubic meter (ug/m3) or as being in...