II 115th CONGRESS 1st Session S. 452 IN THE SENATE OF THE UNITED STATES February 27, 2017 Mr. Flake (for himself, Mr. McCain , Mr. Wicker , Mrs. Capito , and Mr. Cotton ) introduced the following bill; which was read twice and referred to the Committee on Environment and Public Works A BILL To amend the Clean Air Act to delay the enforcement and implementation of the 2015 national ambient air quality standards for ozone.