Environmental Protection Agency April 19, 2021 – Federal Register Recent Federal Regulation Documents

The Environmental Protection Agency (EPA) is correcting a final rule that appeared in the Federal Register on March 22, 2021, and that will become effective on April 21, 2021. The EPA finalized approval of a revision to the Arkansas State Implementation Plan (SIP) submitted by the State of Arkansas through the Arkansas Department of Energy and Environment, Division of Environmental Quality (DEQ). This document corrects an error in the regulatory text. This correction does not change any final action taken by the EPA on March 22, 2021.

The Environmental Protection Agency (EPA) is proposing to fully approve the Limited Maintenance Plan (LMP) submitted by the State of Montana to EPA on March 23, 2020, for the Butte Moderate nonattainment area (NAA) for particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers (PM10) and concurrently redesignate the NAA to attainment for the 24-hour PM10 National Ambient Air Quality Standard (NAAQS). In order to approve the LMP and redesignation, EPA is proposing to determine that the Butte, MT NAA has attained the 1987 24- hour PM10 NAAQS of 150 [micro]g/m\3\. This determination is based upon monitored air quality data for the PM10 NAAQS during the years 2014-2018. EPA is taking this action pursuant to the Clean Air Act (CAA).