# Approval and Promulgation of Air Quality Implementation Plans; Indiana; Lead Ambient Air Quality Standards
> **Rule** · Direct final rule. · Published 2012-03-01 · Effective 2012-04-30 · 77 FR 12482
## Document
- **Document number:** 2012-4970
- **Category:** air-emissions
- **Federal Register citation:** 77 FR 12482
- **CFR reference:** 40 CFR 52
- **Publication date:** 2012-03-01
- **Effective date:** 2012-04-30
- **State:** IN
- **EPA docket:** EPA-R05-OAR-2010-0100
## Abstract

EPA is approving a request submitted by the Indiana Department of Environmental Management (IDEM) on November 24, 2010, to revise the Indiana State Implementation Plan (SIP) for lead (Pb) under the Clean Air Act (CAA). This submittal incorporates the National Ambient Air Quality Standards (NAAQS) for Pb promulgated by EPA in 2008.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/03/01/2012-4970/approval-and-promulgation-of-air-quality-implementation-plans-indiana-lead-ambient-air-quality)
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