# Clean Air Act Approval and Promulgation of State Implementation Plan for Colorado; Denver Nonattainment Area PMINF10 Contingency Measures
> **Rule** · Direct final rule. · Published 1996-09-23 · Effective 1996-12-23 · 61 FR 49682
## Document
- **Document number:** 96-24053
- **Category:** air-emissions
- **Federal Register citation:** 61 FR 49682
- **CFR reference:** 40 CFR 52
- **Publication date:** 1996-09-23
- **Effective date:** 1996-12-23
- **State:** CO
- **EPA docket:** CO-001-0001a
## Abstract

EPA approves the state implementation plan (SIP) revision submitted by the State of Colorado on November 17, 1995, to satisfy the Federal Clean Air Act requirement to submit contingency measures for the Denver moderate PM<INF>10 (particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers) nonattainment area. EPA is approving this SIP revision because it is consistent with the PM<INF>10 contingency measure requirements of the Clean Air Act, as amended (Act).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1996/09/23/96-24053/clean-air-act-approval-and-promulgation-of-state-implementation-plan-for-colorado-denver)
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