[Code of Federal Regulations] [Title 40, Volume 5, Parts 53 to 59] [Revised as of July 1, 2000] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR54.1] [Page 104] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY PART 54--PRIOR NOTICE OF CITIZEN SUITS--Table of Contents Sec. 54.1 Purpose. Section 304 of the Clean Air Act, as amended, authorizes the commencement of civil actions to enforce the Act or to enforce certain requirements promulgated pursuant to the Act. The purpose of this part is to prescribe procedures governing the giving of notices required by subsection 304(b) of the Act (sec. 12, Pub. L. 91-604; 84 Stat. 1706) as a prerequisite to the commencement of such actions.