EPA Sets December 2021 Target For Most Areas To Attain PM2.5 NAAQS

EPA is setting a December 2021 target for most parts of the country to attain its 2012 fine particulate matter (PM2.5) national ambient air quality standard (NAAQS) of 12 micrograms per cubic meter (ug/m3), although some areas with worse levels of PM2.5 could have until December 2025 to cut emissions and comply with the standard. The agency detailed the attainment deadlines in a final rule slated for publication in the Aug. 24 Federal Register that also specifies how states should...