# Approval and Promulgation of Implementation Plans; Designation of Areas for Air Quality Planning Purposes; State of California; PM-10; Redesignation of the Coso Junction Planning Area to Attainment; Approval of PM-10 Maintenance Plan for the Coso Junction Planning Area
> **Rule** · Final rule. · Published 2010-09-03 · Effective 2010-10-04 · 75 FR 54031
## Document
- **Document number:** 2010-21960
- **Category:** air-emissions
- **Federal Register citation:** 75 FR 54031
- **CFR reference:** 40 CFR 52
- **Publication date:** 2010-09-03
- **Effective date:** 2010-10-04
- **State:** CA
- **EPA docket:** EPA-R09-OAR-2010-0336
## Abstract

EPA is approving the State of California's request to redesignate the Coso Junction planning area (CJPA) to attainment for the particulate matter of ten microns or less (PM-10) national ambient air quality standard (NAAQS). EPA is also approving the PM-10 emissions inventory and the maintenance plan for the CJPA, including control measures for Owens Lake, the primary cause of PM-10 nonattainment in the CJPA. Finally, EPA is finding the contribution of motor vehicles to the area's PM-10 problem insignificant; consequently, the State will not have to complete a regional emissions analysis for PM-10 in any future transportation conformity determination for the CJPA.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2010/09/03/2010-21960/approval-and-promulgation-of-implementation-plans-designation-of-areas-for-air-quality-planning)
---
*AI Analytics · CC0 1.0*