Regulation & law · 06/12/2022

EPA Proposes to Approve Montana's Plan for Attainment of 1997 Annual PM 2.5 NAAQS

The Environmental Protection Agency (EPA) is proposing to approve Montana's plan for maintaining the 1997 annual PM 2.5 national ambient air quality standards (NAAQS) and redesignate the Libby Area to attainment for the 1997 annual PM 2.5 NAAQS, based on data from 2014-2021.