# Approval and Promulgation of Implementation Plans: Alaska
> **Rule** · Direct final rule. · Published 1998-09-23 · Effective 1998-11-23 · 63 FR 50762
## Document
- **Document number:** 98-25318
- **Category:** air-emissions
- **Federal Register citation:** 63 FR 50762
- **CFR reference:** 40 CFR 52
- **Publication date:** 1998-09-23
- **Effective date:** 1998-11-23
- **State:** AK
- **EPA docket:** AK10-1-7022a
## Abstract

Environmental Protection Agency (EPA) is approving a revision to the mobile source portion of the 1990 Base Year carbon monoxide(CO) emission inventory of the Anchorage and Fairbanks, Alaska, State CO Implementation Plan. The previous inventory used the MOBILE 4.1 model; the revised inventory estimates use a newer version of the model, MOBILE 5.0a.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/09/23/98-25318/approval-and-promulgation-of-implementation-plans-alaska)
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