The Environmental Protection Agency (EPA) is approving a State Implementation Plan (SIP) revision submitted by the State of South Dakota on January 3, 2020 that revises the Administrative Rules of South Dakota (ARSD), Air Pollution Control Program, updating the chapter pertaining to definitions. The EPA is taking this action pursuant to the Clean Air Act (CAA).

The Environmental Protection Agency (EPA) is approving a State Implementation Plan (SIP) revision submitted by the State of New Hampshire on March 11, 2019. This revision establishes sulfur content limitations for fuels. In addition, the State requested withdrawal from the SIP of the existing sulfur limitations regulation, which will be superseded by the State's revised sulfur limitations regulation. The intended effect of this action is to approve the State's March 11, 2019 submittal into the New Hampshire SIP and remove from the SIP the superseded sulfur in fuels limitations.

Through this supplemental notice of proposed rulemaking (``supplemental proposal'' or ``SNPRM''), the Environmental Protection Agency (EPA) is seeking public comment on the Agency's additional and clarified technical rationale related to the proposed approval of Tennessee's February 26, 2020, state implementation plan (SIP) revisions requesting the removal of Tennessee's motor vehicle inspection and maintenance (I/M) program requirements for Davidson, Sumner, Rutherford, Williamson, and Wilson Counties in Tennessee (also known as the Middle Tennessee Area) and Hamilton County (also known as

The Environmental Protection Agency (EPA) is proposing to approve the State of Utah's Source Category Exemptions Revisions as submitted on November 5, 2019. The EPA is taking this action pursuant to the Clean Air Act (CAA).