On May 21, 2020, for public comment and hearing, the Board proposed rule amendments that are “identical in substance” to federal actions taken during 2019 and the second half of 2018. The federal actions were taken by the United States Environmental Protection Agency (USEPA) and concerned the National Ambient Air Quality Standards (NAAQS). The USEPA actions considered by the Board included the October 16, 2018 corrections to area designations for the 2015 NAAQS for ozone (O3); the December 27, 2018 and May 28, 2019 area redesingations for the 1997 primary NAAQS for fine particulate matter (PM2.5); the March 29, 2019, May 28, 2019, and September 26, 2019 designation of new federal reference methods (FRMs) and federal equivalent methods (FEMs) for sulfur dioxide (SO2), O3, and carbon monoxide; the August 23, 2019 area reclassification for O3; the September 13, 2019 reconsideration of an area designation for the 2016 SO2 NAAQS; and the December 15, 2019 release of an update to USEPA’s List of Designated Referenc
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