The Arkansas Department of Energy and Environment, Division of Environmental Quality (DEQ) has submitted updated regulations for receiving delegation and approval of its program for the implementation and enforcement of certain National Emission Standards for Hazardous Air Pollutants (NESHAP) promulgated under the Clean Air Act (CAA), as provided for under the delegation mechanism previously approved by the Environmental Protection Agency (EPA). The EPA is approving DEQ's requested update of its NESHAP delegation.

In this action, the U.S. Environmental Protection Agency (EPA) is making technical corrections to the general provisions of the National Emission Standards for Hazardous Air Pollutants (NESHAP). Specifically, on November 19, 2021, EPA finalized changes to the NESHAPs for Refractory Products Manufacturing, Carbon Black Production (major sources), Cyanide Chemicals Manufacturing, and Carbon Black Production Area Sources and, also amended the general provisions.

This action finalizes the residual risk and technology review (RTR) conducted for the Mercury Cell Chlor-Alkali Plants source category regulated under national emission standards for hazardous air pollutants (NESHAP). In addition, this action finalizes the beyond-the- floor determination that EPA performed in response to a petition for reconsideration of the 2003 NESHAP.

The Environmental Protection Agency (EPA) is approving revisions to the State Implementation Plan (SIP) for Indiana and revisions to the operating permit program for Ohio. The revisions incorporate changes to the definition of ``chemical process plants'' under Indiana's Prevention of Significant Deterioration (PSD) regulations and under Ohio's operating permit program. EPA also provided an opportunity for public comment on similar changes to the definition of ``major stationary source'' in Ohio's PSD regulations that were approved into the SIP on October 28, 2014.