# Approval and Promulgation of Air Quality Implementation Plans; Wyoming; Revisions to the Wyoming Air Quality Standards and Regulations; Ambient Standards for Nitrogen Oxides and for Ozone
> **Rule** · Direct final rule. · Published 2014-09-15 · Effective 2014-11-14 · 79 FR 54910
## Document
- **Document number:** 2014-21573
- **Category:** air-emissions
- **Federal Register citation:** 79 FR 54910
- **CFR reference:** 40 CFR 52
- **Publication date:** 2014-09-15
- **Effective date:** 2014-11-14
- **State:** WY
- **EPA docket:** EPA-R08-OAR-2011-0659
## Abstract

The Environmental Protection Agency (EPA) is taking direct final action to approve a State Implementation Plan (SIP) revision submitted by the State of Wyoming. The revision affects Wyoming's Air Quality Standards and Regulations (WAQSR) regarding ambient standards for nitrogen oxides (NO<INF>X</INF>) and for ozone. This action is being taken under section 110 of the Clean Air Act (CAA).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2014/09/15/2014-21573/approval-and-promulgation-of-air-quality-implementation-plans-wyoming-revisions-to-the-wyoming-air)
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