# Approval and Promulgation of Air Quality Implementation Plans; Maryland; Nitrogen Oxides Ozone Season Emissions Caps for Non-Trading Large Nitrogen Oxides Units; Amendments
> **Rule** · Final rule. · Published 2025-07-24 · Effective 2025-08-25 · 90 FR 34763
## Document
- **Document number:** 2025-13891
- **Category:** air-emissions
- **Federal Register citation:** 90 FR 34763
- **CFR reference:** 40 CFR 52
- **Publication date:** 2025-07-24
- **Effective date:** 2025-08-25
- **State:** MD
- **EPA docket:** EPA-R03-OAR-2024-0512
## Abstract

The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision submitted by the State of Maryland. This revision (Maryland Submittal #24-01) pertains to the re-allocation of nitrogen oxides (NO<INF>X</INF>) ozone season emission caps for large non-electric generating units (non-EGUs, affected units). The amendment also updates a cross reference to the Cross State Air Pollution Rule (CSAPR). This action is being taken under the Clean Air Act (CAA).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/07/24/2025-13891/approval-and-promulgation-of-air-quality-implementation-plans-maryland-nitrogen-oxides-ozone-season)
---
*AI Analytics · CC0 1.0*