[Code of Federal Regulations] [Title 40, Volume 3] [Revised as of July 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR52.14] [Page 12] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 52--APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS--Table of Contents Subpart A--General Provisions Sec. 52.14 State ambient air quality standards. Any ambient air quality standard submitted with a plan which is less stringent than a national standard is not considered part of the plan.