# Review of the Primary National Ambient Air Quality Standards for Sulfur Oxides
> **Rule** · Final action. · Published 2019-03-18 · Effective 2019-04-17 · 84 FR 9866
## Document
- **Document number:** 2019-03855
- **Category:** air-emissions
- **Federal Register citation:** 84 FR 9866
- **CFR reference:** 40 CFR 50
- **Publication date:** 2019-03-18
- **Effective date:** 2019-04-17
- **EPA docket:** EPA-HQ-OAR-2013-0566
## Abstract

Based on the Environmental Protection Agency's (EPA's) review of the air quality criteria addressing human health effects and the primary national ambient air quality standard (NAAQS) for sulfur oxides (SO<INF>X</INF>), the EPA is retaining the current standard, without revision.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2019/03/18/2019-03855/review-of-the-primary-national-ambient-air-quality-standards-for-sulfur-oxides)
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