Nitrogen oxides

Implementation of the Revoked 1997 8-Hour Ozone National Ambient Air Quality Standards; Updates to 40 CFR Part 52 for Areas That Attained by the Attainment Date

The Environmental Protection Agency (EPA) is updating part 52 of title 40, chapter 1 of the Code of Federal Regulations (CFR) to codify its findings that nine areas in four states attained the revoked 1997 8-hour ozone National Ambient Air Quality Standards (herein referred to as the 1997 ozone NAAQS) by the applicable attainment dates. In February 2019, EPA Regional Offices sent letters to the affected states to communicate the EPA's findings.

Publication Date: 
Friday, October 9, 2020 - 4:00am

Implementation of the Revoked 1997 8-Hour Ozone National Ambient Air Quality Standards; Updates for Areas that Attained by the Attainment Date

The Environmental Protection Agency (EPA) is proposing updates to the Code of Federal Regulations (CFR) to codify its findings that nine areas in four states attained the revoked 1997 8-hour ozone National Ambient Air Quality Standards (herein referred to as the 1997 ozone NAAQS) by the applicable attainment dates. The parallel direct final rule is published in the ``Rules and Regulations'' section of this issue of the Federal Register because the Agency views this as a noncontroversial action.

Publication Date: 
Friday, October 9, 2020 - 4:00am