# Approval and Promulgation of Air Quality Implementation Plan; Colorado; PM10 and NOINFX/INF Mobile Source Emission Budget Plans for Denver, CO
> **Rule** · Final rule. · Published 1998-03-31 · Effective 1998-04-30 · 63 FR 15294
## Document
- **Document number:** 98-8214
- **Category:** air-emissions
- **Federal Register citation:** 63 FR 15294
- **CFR reference:** 40 CFR 52
- **Publication date:** 1998-03-31
- **Effective date:** 1998-04-30
- **State:** CO
- **EPA docket:** CO-001-0022 and CO-001-0023
## Abstract

EPA is approving the State Implementation Plan (SIP) revisions submitted by the Governor of Colorado on July 18, 1995 and April 22, 1996. The PM10 and NO<INF>X</INF> emissions budgets contained in these SIP revisions are used to assess the conformity of transportation plans, transportation improvement programs and, where appropriate, federally funded projects for the applicable periods required by EPA's conformity rules. EPA originally proposed approval of the two emissions budget SIPs on October 3, 1996. Based upon comments received on that proposal, EPA published a second proposal on August 5, 1997, seeking additional input on certain issues. In reaching its final decision to approve the July 18, 1995 and April 22, 1996 PM10 and NO<INF>X</INF> SIP submittals, EPA has considered the comments it received on both its October 3, 1996 and August 5, 1997 Federal Register documents.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/03/31/98-8214/approval-and-promulgation-of-air-quality-implementation-plan-colorado-pm10-and-noinfxinf-mobile)
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