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Public Comment Period for the 2015 Ozone Infrastructure State Implementation Plan

  • 9/18/2018 8:55:00 AM
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The Iowa Department of Natural Resources (DNR) is requesting public comment on the State of Iowa’s state implementation plan (SIP) for the national ambient air quality standards (NAAQS) for ozone.

Section 110(a) of the Clean Air Act requires states to adopt and submit a plan for the implementation, maintenance, and enforcement of each NAAQS within 3 years of promulgation to the U.S. Environmental Protection Agency (EPA). These plans are typically referred to as infrastructure SIPs.

The ozone NAAQS was revised by EPA on October 1, 2015. The level of the standard was lowered from 0.075 parts per million (ppm) to 0.070 ppm per 8-hour average concentration. The EPA’s decision to tighten the standard was based upon the latest review of available scientific information linking health effects to ozone concentrations.

An electronic copy of the 2015 ozone infrastructure SIP may be viewed at, click on Public Participation, and select Public Input or by clicking here. Any person may make written comments on this proposed SIP revision on or before October 19, 2018. Written comments should be directed to Wendy Walker, Department of Natural Resources, Wallace State Office Building, 502 E 9th Street, Des Moines, IA 50319-0034, fax 515-725-9501, or by electronic mail to

A public hearing will be held on October 19, 2018, at 1:00 p.m. in conference room 2E at the Wallace State Office Building, 502 E 9th Street, Des Moines, IA 50319-0034. All comments must be received no later than October 19, 2018.

Anyone who intends to attend the public hearing and has special requirements such as those related to hearing or mobility impairments should contact Wendy Walker at 515-725-9570 to advise of any specific needs.

A responsiveness summary will be prepared by the Iowa DNR following the close of the public comment period. The responsiveness summary will include any written or oral comments received during the public participation process and the Iowa DNR’s response to the comments. The completed responsiveness summary will be forwarded to EPA and made available to the public upon request.