[Code of Federal Regulations] [Title 40, Volume 24] [Revised as of July 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR204.57] [Page 96] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 204_NOISE EMISSION STANDARDS FOR CONSTRUCTION EQUIPMENT--Table of Contents Subpart B_Portable Air Compressors Sec. 204.57 Selective enforcement auditing.