EPA to reconsider particulate matter NAAQS
Green Car Congress
JUNE 12, 2021
The US Environmental Protection Agency (EPA) announced that it will reconsider the previous administration’s decision to retain the particulate matter (PM) National Ambient Air Quality Standards (NAAQS) ( earlier post ), which were last strengthened in 2012. EPA sets both an annual and a 24-hour standard for fine particles (PM 2.5 ). EPA expects to issue a proposed rulemaking in Summer 2022 and a final rule in Spring 2023.