# Approval and Promulgation of Air Quality Implementation Plans; Iowa Update to Materials Incorporated by Reference
> **Rule** · Final rule; annual update to IBR process. · Published 1999-11-22 · Effective 1999-11-22 · 64 FR 63693
## Document
- **Document number:** 99-30239
- **Category:** air-emissions
- **Federal Register citation:** 64 FR 63693
- **CFR reference:** 40 CFR 52
- **Publication date:** 1999-11-22
- **Effective date:** 1999-11-22
- **State:** IA
- **EPA docket:** IA 075-1075
## Abstract

EPA is updating the materials submitted by Iowa that are incorporated by reference into the State Implementation Plan (SIP). The regulations affected by this update have been previously submitted by the state agency and approved by EPA.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/11/22/99-30239/approval-and-promulgation-of-air-quality-implementation-plans-iowa-update-to-materials-incorporated)
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