Public Comment Period for the 2010 Nitrogen Dioxide State Implementation Plan
Posted: 04/04/2013
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 nitrogen dioxide (NO2).

The state implementation plan has been written to fulfill the requirements of Section 110 of the federal Clean Air Act (CAA). Section 110(a) of the CAA requires each state to adopt and submit a plan for the implementation, maintenance, and enforcement of each NAAQS within 3 years of promulgation to the Administrator of the U.S. Environmental Protection Agency (EPA).

The NO2 NAAQS has both a primary and secondary standard. EPA promulgated a 1-hour, primary standard of 100 parts per billion (ppb) on January 22, 2010, while simultaneously retaining the annual average standard of 53 ppb. This revision to the primary standard was published in the Federal Register on February 9, 2010 (75 FR 6474-6537). In a separate action EPA retained the 53 ppb annual average secondary NO2 NAAQS on March 20, 2012 (77 FR 20218-20272) and did not include the 1-hour standard as a secondary standard. Iowa was designated unclassifiable/attainment for the 1-hour NO2 NAAQS on January 20, 2012 (77 FR 9532-9588). 

An electronic copy of the SIP may be viewed at, click on Stakeholder Involvement, and select Public Input. Any person may make written comments on this proposed SIP revision on or before May 8, 2013.  Written comments should be directed to Wendy Walker, Department of Natural Resources, Air Quality Bureau, 7900 Hickman Road, Suite 1, Windsor Heights, Iowa, 50324, fax 515-242-5094, or by electronic mail to

A public hearing will be held on May 8, 2013 at 1:00 p.m. in the conference rooms at the Iowa DNR’s Air Quality Bureau office located at 7900 Hickman Road, Suite 1, Windsor Heights, Iowa.  All comments must be received no later than May 8, 2013.

Any person 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 515-281-6061 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.

This list serve article is intended for consultants, industries, environmental groups, general public, and other entities regulated under the Clean Air Act. It was written by the DNR Air Quality Bureau to share regulatory news, program updates and technical guidance.