This page contains guidance memos to aid states in developing air quality State Implementation Plans (SIPs). The goal of this guidance is to minimize federal and state burden in developing SIPs, while still ensuring the plans' effectiveness in complying with the Clean Air Act. It was developed through collaboration with the National Association of Clean Air Agencies (NACAA/ECOs) SIP Reform Work Group.
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- Regional Consistency for the Administrative Requirements of State Implementation Plan Submittals and Use of "Letter Notices", dated April 6, 2011 (PDF)(13 pp, 3 MB, April 6, 2011)
- Transportation Conformity-related Clarifications to Appendix C of the April 6, 2011 Memorandum, dated July 27, 2011 (PDF)(2 pp, 141 K)
- Options and Efficiency Tools for EPA Action on State Implementation Plan (SIP) Submittals, dated October 31, 2011 (PDF)(15 pp, 128 K)
- Guidelines for Preparing Letters Submitting State Implementation Plans (SIPs) to EPA and for Preparing Public Notices for SIPs, dated November 22, 2011 (PDF)(12 pp, 966 K)