# Approval and Promulgation of Implementation Plans; Designation of Areas for Air Quality Planning Purposes; State of Arizona; Finding of Attainment for Ajo Particulate Matter of 10 Microns or Less (PM10) Nonattainment Area; Determination Regarding Applicability of Certain Clean Air Act Requirements
> **Rule** · Direct final rule. · Published 2006-02-08 · Effective 2006-04-10 · 71 FR 6352
## Document
- **Document number:** 06-1174
- **Category:** air-emissions
- **Federal Register citation:** 71 FR 6352
- **CFR reference:** 40 CFR 52
- **Publication date:** 2006-02-08
- **Effective date:** 2006-04-10
- **State:** AZ
- **EPA docket:** EPA-R09-OAR-2005-AZ-0006
## Abstract

EPA is taking direct final action to determine that the Ajo moderate PM<INF>10</INF> nonattainment area in Arizona has attained the National Ambient Air Quality Standards (NAAQS) for particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers (PM<INF>10</INF>). This determination is based upon monitored air quality data for the PM<INF>10</INF> NAAQS during the years 2002-2004. EPA also finds that the Ajo area has continued to attain the PM<INF>10</INF> NAAQS since 2004. Based on this determination, EPA is also determining that certain Clean Air Act requirements are not applicable for so long as the Ajo area continues to attain the PM<INF>10</INF> NAAQS.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/02/08/06-1174/approval-and-promulgation-of-implementation-plans-designation-of-areas-for-air-quality-planning)
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