# Approval and Promulgation of State Implementation Plan Revisions; Infrastructure Requirements for the 1997 and 2006 PM2.5 National Ambient Air Quality Standards; Prevention of Significant Deterioration Requirements for PM2.5 Increments and Major and Minor Source Baseline Dates; Colorado
> **Rule** · Final rule. · Published 2013-09-23 · Effective 2013-10-23 · 78 FR 58186
## Document
- **Document number:** 2013-22967
- **Category:** air-emissions
- **Federal Register citation:** 78 FR 58186
- **CFR reference:** 40 CFR 52
- **Publication date:** 2013-09-23
- **Effective date:** 2013-10-23
- **State:** CO
- **EPA docket:** EPA-R08-OAR-2009-0810, FRL-9901-04-Region 8
## Abstract

EPA is approving State Implementation Plan (SIP) submissions from the State of Colorado to demonstrate that the SIP meets the infrastructure requirements of the Clean Air Act (CAA) for the National Ambient Air Quality Standards (NAAQS) promulgated for PM<INF>2.5</INF> on July 18, 1997 and on October 17, 2006. The CAA requires that each state, after a new or revised NAAQS is promulgated, review their SIPs to ensure that they meet infrastructure requirements. The State of Colorado provided infrastructure SIP submissions on April 4, 2008 and June 4, 2010 for the 1997 and 2006 PM<INF>2.5</INF> NAAQS, respectively. In addition, EPA is approving portions of SIP revisions submitted by the State of Colorado on May 11, 2012 and May 13, 2013. The revisions update Regulation 3 of the Air Quality Control Commission permitting requirements for the Prevention of Significant Deterioration (PSD) program to incorporate the required elements of the 2008 PM<INF>2.5</INF> NSR Implementation Rule and the 2010 PM<INF>2.5</INF> Increment Rule.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2013/09/23/2013-22967/approval-and-promulgation-of-state-implementation-plan-revisions-infrastructure-requirements-for-the)
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