# Approval and Promulgation of Air Quality Implementation Plans; Wisconsin; Particulate Matter Standards
> **Rule** · Direct final rule. · Published 2010-04-08 · Effective 2010-06-07 · 75 FR 17865
## Document
- **Document number:** 2010-7968
- **Category:** air-emissions
- **Federal Register citation:** 75 FR 17865
- **CFR reference:** 40 CFR 52
- **Publication date:** 2010-04-08
- **Effective date:** 2010-06-07
- **State:** WI
- **EPA docket:** EPA-R05-OAR-2009-0731
## Abstract

Wisconsin updated its state ambient air quality standards rules to match the current Federal standards. The updates were made to the particulate matter standards by adding fine particulate standards and revoking the state's course particulate standards. EPA revised its particulate matter standards in October 2006 by strengthening the 24- hour fine particulate standard and revoking the annual standard for course particulate. EPA is approving the revisions to the Wisconsin State Implementation Plan (SIP) as requested by the state on September 11, 2009.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2010/04/08/2010-7968/approval-and-promulgation-of-air-quality-implementation-plans-wisconsin-particulate-matter-standards)
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