# Air Quality Designations for the 2010 Primary Nitrogen Dioxide (NO2) National Ambient Air Quality Standards
> **Rule** · Final rule. · Published 2012-02-17 · Effective 2012-02-29 · 77 FR 9532
## Document
- **Document number:** 2012-3150
- **Category:** air-emissions
- **Federal Register citation:** 77 FR 9532
- **CFR reference:** 40 CFR 81
- **Publication date:** 2012-02-17
- **Effective date:** 2012-02-29
- **EPA docket:** EPA-HQ-OAR-2011-0572
## Abstract

This rule establishes air quality designations for all areas in the United States for the 2010 Primary Nitrogen Dioxide (NO<INF>2</INF>) National Ambient Air Quality Standards (NAAQS). Based on air quality monitoring data, the EPA is issuing this rule to designate all areas of the country as "unclassifiable/attainment" for the 2010 NO<INF>2</INF> NAAQS. The EPA is designating areas as "unclassifiable/attainment" to mean that available information does not indicate that the air quality in these areas exceeds the 2010 NO<INF>2</INF> NAAQS.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/02/17/2012-3150/air-quality-designations-for-the-2010-primary-nitrogen-dioxide-no2-national-ambient-air-quality)
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