This action finalizes the technology review conducted for the paint stripping and miscellaneous surface coating operations area source categories regulated under national emission standards for hazardous air pollutants (NESHAP). These final amendments also address provisions regarding electronic reporting; make miscellaneous clarifying and technical corrections; simplify the petition for exemption process; and clarify requirements for emissions during periods of startup, shutdown, and malfunction (SSM).

The Environmental Protection Agency (EPA) is approving elements of a State Implementation Plan (SIP) submission from Indiana regarding the infrastructure requirements of section 110 of the Clean Air Act (CAA) for the 2015 ozone National Ambient Air Quality Standards (NAAQS). The infrastructure requirements are designed to ensure that the structural components of each state's air quality management program are adequate to meet the state's responsibilities under the CAA.

The Environmental Protection Agency (EPA) is approving a State Implementation Plan (SIP) revision submitted by the State of Tennessee on April 9, 2021. Specifically, EPA is approving updates to the incorporation by reference of Federal guidelines on air quality modeling in the Tennessee SIP. EPA is also converting the previous conditional approval regarding infrastructure SIP prevention of significant deterioration (PSD) elements for the 2015 ozone national ambient air quality standards (NAAQS) for Tennessee to a full approval.

The Environmental Protection Agency (EPA or ``Agency'') is determining that the Imperial County nonattainment area would have attained the 2015 ozone national ambient air quality standard (NAAQS) by the August 3, 2021 ``Marginal'' area attainment date, but for emissions emanating from outside the United States.