# Approval and Promulgation of Air Quality Implementation Plans; Colorado; 1990 Base Year Carbon Monoxide Emission Inventories for Colorado
> **Rule** · Direct final rule. · Published 1996-12-23 · Effective 1997-02-21 · 61 FR 67466
## Document
- **Document number:** 96-32222
- **Category:** air-emissions
- **Federal Register citation:** 61 FR 67466
- **CFR reference:** 40 CFR 52
- **Publication date:** 1996-12-23
- **Effective date:** 1997-02-21
- **State:** CO
- **EPA docket:** CO24-1-5701a, CO25-1-5700a, CO26-1-5702a
## Abstract

EPA is approving the 1990 base year carbon monoxide (CO) emission inventories for Colorado Springs, Denver/Longmont, and Fort Collins that were submitted by the State to satisfy certain requirements of the Clean Air Act (CAA), as amended in 1990.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1996/12/23/96-32222/approval-and-promulgation-of-air-quality-implementation-plans-colorado-1990-base-year-carbon)
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