Air Plan Approval and Disapproval; Colorado; Serious Attainment Plan Elements and Related Revisions for the 2008 8-Hour Ozone Standard for the Denver Metro/North Front Range Nonattainment Area
air-emissions · Rule · Published 2023-11-07 · Effective 2023-12-07 · CO · 88 FR 76676
Document
Document number
2023-24230
Federal Register citation
88 FR 76676
CFR reference
40 CFR 52
Type
Rule
Action
Final rule.
Category
air-emissions
Publication date
2023-11-07
Effective date
2023-12-07
State
CO
EPA docket
EPA-R08-OAR-2023-0272
Abstract
The Environmental Protection Agency (EPA) is approving portions and disapproving portions of a state implementation plan (SIP) revision submitted by the State of Colorado to meet Clean Air Act (CAA) requirements for the 2008 8-hour ozone national ambient air quality standards (NAAQS) in the Denver Metro/North Front Range nonattainment area (DMNFR Area). Specifically, the EPA is approving the submitted enhanced monitoring SIP element as meeting applicable Serious area requirements for the 2008 8-hour ozone NAAQS, and is disapproving the contingency measure element of the SIP submittal. The EPA is taking this action pursuant to the CAA.