# Implementation of the 2015 National Ambient Air Quality Standards for Ozone: Nonattainment Area Classifications Approach
> **Rule** · Final rule. · Published 2018-03-09 · Effective 2018-05-08 · 83 FR 10376
## Document
- **Document number:** 2018-04810
- **Category:** air-emissions
- **Federal Register citation:** 83 FR 10376
- **CFR reference:** 40 CFR 51
- **Publication date:** 2018-03-09
- **Effective date:** 2018-05-08
- **EPA docket:** EPA-HQ-OAR-2016-0202
## Abstract

In this final rule, the EPA is establishing the air quality thresholds that define the classifications assigned to all nonattainment areas for the 2015 ozone national ambient air quality standards (NAAQS) (the "2015 ozone NAAQS") promulgated on October 1, 2015. This final rule also establishes the timing of attainment dates for each nonattainment area classification.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/03/09/2018-04810/implementation-of-the-2015-national-ambient-air-quality-standards-for-ozone-nonattainment-area)
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