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Polk County Board of Supervisors will hold a hearing on proposed amendments to the Polk County's Air Pollution Rules and Regulations. The proposed amendments will make the Polk County rules consistent with the Iowa Administrative Code recent updates. A summary of the changes implemented can be found here and a red-lined version of the regulation can be found here. The hearing will be November 20, 2018 at 9:30 a.m. in Room 120, Polk County Administrative Office Building, 111 Court Avenue, Des Moines, Iowa. Written comments will be accepted through November 19 and should be directed to Polk County Public Works Department, Air Quality Division, 5885 NE 14th Street, Des Moines, Iowa , or by e-mail to: