# Air Plan Approval; Missouri; Revision to Reference Methods Rule
> **Rule** · Final rule. · Published 2019-08-22 · Effective 2019-09-23 · 84 FR 43699
## Document
- **Document number:** 2019-18035
- **Category:** air-emissions
- **Federal Register citation:** 84 FR 43699
- **CFR reference:** 40 CFR 52
- **Publication date:** 2019-08-22
- **Effective date:** 2019-09-23
- **State:** MO
- **EPA docket:** EPA-R07-OAR-2019-0293
## Abstract

The Environmental Protection Agency (EPA) is taking final action to approve a State Implementation Plan (SIP) revision submitted by the State of Missouri on January 14, 2019. The revision submitted by the state is an amendment to a rule relating to reference methods for determining ambient air/atmosphere data and information necessary for the enforcement of air pollution control regulations throughout Missouri. The revision is administrative in nature and either incorporates by reference or updates state rules to match Federal regulations. This revision does not have an adverse effect on air quality. The EPA's approval of this rule revision is being done in accordance with the requirements of the Clean Air Act (CAA).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2019/08/22/2019-18035/air-plan-approval-missouri-revision-to-reference-methods-rule)
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