# Approval and Promulgation of Implementation Plans; Wallula, Washington PM10 Nonattainment Area; Serious Area Plan for Attainment of the Annual and 24-Hour PM10 Standards
> **Rule** · Final rule. · Published 2005-05-02 · Effective 2005-06-01 · 70 FR 22597
## Document
- **Document number:** 05-8597
- **Category:** air-emissions
- **Federal Register citation:** 70 FR 22597
- **CFR reference:** 40 CFR 52
- **Publication date:** 2005-05-02
- **Effective date:** 2005-06-01
- **State:** WA
- **EPA docket:** R10-OAR-2004-WA-0001
## Abstract

The Environmental Protection Agency (EPA or Agency) is taking final action to approve Washington's State Implementation Plan for the Wallula, Washington serious nonattainment area for particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers (PM<INF>10</INF>). Wallula was initially classified as a moderate nonattainment area for PM<INF>10</INF> pursuant to the Clean Air Act Amendments of 1990. In 2001, it was reclassified as a serious nonattainment area for PM<INF>10</INF>. As a result, Washington was required to submit a serious area plan for bringing the area into attainment. Washington submitted a serious area plan on November 30, 2004. We are approving this plan for Wallula, Washington because it meets the Clean Air Act requirements for PM<INF>10</INF> serious nonattainment areas.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/05/02/05-8597/approval-and-promulgation-of-implementation-plans-wallula-washington-pm10-nonattainment-area-serious)
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