# Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes: Washington
> **Rule** · Direct final rule. · Published 2000-10-04 · Effective 2000-12-04 · 65 FR 59128
## Document
- **Document number:** 00-25226
- **Category:** air-emissions
- **Federal Register citation:** 65 FR 59128
- **CFR reference:** 40 CFR 52
- **Publication date:** 2000-10-04
- **Effective date:** 2000-12-04
- **State:** WA
- **EPA docket:** WA-71-7146a
## Abstract

Environmental Protection Agency (EPA) approves the Thurston County, Washington PM-10 area maintenance plan and redesignation request from nonattainment to attainment as revisions to the Washington State Implementation Plan. PM-10 air pollution is suspended particulate matter with a diameter less than or equal to a nominal ten micrometers.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2000/10/04/00-25226/approval-and-promulgation-of-implementation-plans-and-designation-of-areas-for-air-quality-planning)
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