# Approval and Promulgation of Implementation Plans; State of Iowa
> **Rule** · Direct final rule. · Published 2015-01-12 · Effective 2015-03-13 · 80 FR 1471
## Document
- **Document number:** 2015-00079
- **Category:** air-emissions
- **Federal Register citation:** 80 FR 1471
- **CFR reference:** 40 CFR 52
- **Publication date:** 2015-01-12
- **Effective date:** 2015-03-13
- **State:** IA
- **EPA docket:** EPA-R07-OAR-2014-0163
## Abstract

The Environmental Protection Agency (EPA) is approving revisions to the State Implementation Plan (SIP) for the state of Iowa. The purpose of these revisions is to update the Polk County Board of Health Rules and Regulations, Chapter V, Air Pollution. The revisions reflect updates to the Iowa statewide rules previously approved by EPA and will ensure consistency between the applicable local agency rules and Federally-approved rules. On April 15, 2014, the state notified EPA that it is withdrawing their request to approve greenhouse gases definition as relating to greenhouse gas emissions. This withdrawal request is in recognition of the July 12, 2013, U.S. Court of Appeals for the District of Columbia decision which vacated the regulation known as the "biogenic deferral rule." On October 31, 2014, the state requested that EPA withdraw their request to approve the definition of anaerobic lagoon.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2015/01/12/2015-00079/approval-and-promulgation-of-implementation-plans-state-of-iowa)
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