# Approval and Promulgation of State Implementation Plans: Alaska
> **Rule** · Direct final rule. · Published 1999-12-29 · Effective 2000-02-28 · 64 FR 72940
## Document
- **Document number:** 99-33525
- **Category:** air-emissions
- **Federal Register citation:** 64 FR 72940
- **CFR reference:** 40 CFR 52
- **Publication date:** 1999-12-29
- **Effective date:** 2000-02-28
- **State:** AK
- **EPA docket:** AK-21-1709-a
## Abstract

The Environmental Protection Agency (EPA) approves various revisions to the carbon monoxide (CO) Alaska State Implementation Plan (SIP) for Alaska. These revisions to the SIP were submitted in three different packages to EPA, dated February 6, 1997, June 1, 1998, and September 10, 1998. The revisions cover numerous regulations, the Transportation Conformity Rule (18 AAC 50); Emissions Inspection and Maintenance (I/M) requirements for Motor Vehicles (18 AAC 52); and Fuel Requirements for Motor Vehicles (18 AAC 53). Highlights include changing the I/M program schedule from annual to biennial, replacing the CO contingency measures for Anchorage, and streamlining and updating several portions of the Alaska Air Quality Control Plan for more efficient reading and organization.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/12/29/99-33525/approval-and-promulgation-of-state-implementation-plans-alaska)
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