The Environmental Protection Agency (EPA) is taking final action to approve revisions to the Butte County Air Quality Management District (BCAQMD), El Dorado County Air Quality Management District (EDCAQMD), Mojave Desert Air Quality Management District (MDAQMD), San Diego County Air Pollution Control District (SDCAPCD) and Ventura County Air Pollution Control District (VCAPCD) portions of the California State Implementation Plan (SIP).

The Environmental Protection Agency (EPA) is approving a State Implementation Plan (SIP) revision submitted by the State of Connecticut. This revision amends a Connecticut air-quality regulation for controlling particulate matter (PM) and visible emissions. The intended effect of this action is to define the process industries and activities to which this regulation applies, and to make technical corrections to an emission-rate calculation method. This action is being taken in accordance with the Clean Air Act.

The Environmental Protection Agency (EPA) is proposing to approve a state implementation plan (SIP) revision submitted by the State of Maryland. This revision pertains to the expansion in the use of Emission Reduction Credits (ERCs) when new or modified major stationary sources of ozone precursors are required to obtain emission offsets within the State of Maryland. This action is being taken under the Clean Air Act (CAA).

The Environmental Protection Agency (EPA) is approving the State of South Dakota's January 15, 2020, State Implementation Plan (SIP) submission that addresses infrastructure requirements for the 2015 ozone National Ambient Air Quality Standards (NAAQS).