# Air Plan Approval; Maryland; Baltimore Area Base Year Inventory for the 2015 Ozone National Ambient Air Quality Standards
> **Rule** · Final rule. · Published 2021-11-05 · Effective 2021-12-06 · 86 FR 61075
## Document
- **Document number:** 2021-23975
- **Category:** air-emissions
- **Federal Register citation:** 86 FR 61075
- **CFR reference:** 40 CFR 52
- **Publication date:** 2021-11-05
- **Effective date:** 2021-12-06
- **State:** MD
- **EPA docket:** EPA-R03-OAR-2021-0017
## Abstract

The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision formally submitted by the State of Maryland. This revision consists of the base year inventory for the Baltimore, Maryland marginal nonattainment area (Baltimore Area) for the 2015 ozone national ambient air quality standards (NAAQS). This action is being taken under the Clean Air Act (CAA).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/11/05/2021-23975/air-plan-approval-maryland-baltimore-area-base-year-inventory-for-the-2015-ozone-national-ambient)
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