Implementation Plans

Topics:

Air Quality
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Implementation Plans

This web page provides links to recent State Implementation Plan (SIP) submissions that Iowa has made to EPA. The web page includes links to information about recent Iowa designation recommendations for National Ambient Air Quality Standards (NAAQs) that were promulgated or revised since in 2006.

Questions about the information on this web page may be directed to Matthew Johnson at 515-725-9554 or Matthew.Johnson@dnr.iowa.gov.

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Designation Recommendations

The Clean Air Act requires the state to submit designation recommendations to EPA within one year of any NAAQS revision. EPA is responsible for issuing the final designations. EPA's final designations can be found in 40 CFR Part 81.

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Implementation Plans for Nonattainment and Maintenance Areas

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Muscatine PM2.5 SIP Revision

On February 18, 2014, the Environmental Protection Commission approved a revision to the State Implementation Plan (SIP) to prevent future violations of the 2006 24-hour fine particulate (PM2.5) National Ambient Air Quality Standards (NAAQS) in Muscatine. The SIP revision was forwarded to U.S. EPA on February 18th for federal notice and approval. EPA approved the SIP revision on December 1, 2014.

Supporting Documents

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Implementation Plans for New or Revised NAAQS

Iowa is required under the Clean Air Act to develop State Implementation Plans (SIPs) for new and revised National Ambient Air Quality Standards (NAAQs), referred to as infrastructure SIPs. Infrastructure SIPs demonstrate that the state has the authority and resources to implement a new or revised NAAQS.

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Regional Haze

In 1999, EPA established rules to improve visibility in federally protected Class I areas, such as larger national parks and wilderness areas. The regional haze regulations require all states to periodically submit State Implementation Plan (SIP) revisions to address emissions of visibility impairing pollutants. The first regional haze SIPs were due in 2007 and comprehensive revisions are generally due approximately every 10 years thereafter (EPA provided a one-time extension for the second regional haze SIPs). At the midpoint of each 10-year plan, a 5-year progress report is due.

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