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Code of Federal Regulations
C.F.R. Title 40—Protection of Environment
CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY
SUBCHAPTER C—AIR PROGRAMS
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PART 81—DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES
Subpart A—Meaning of Terms
(§ 81.1)
Subpart B—Designation of Air Quality Control Regions
(§§ 81.11 - 81.276)
Subpart C—Section 107 Attainment Status Designations
(§§ 81.300 - 81.356)
Subpart D—Identification of Mandatory Class I Federal Areas Where Visibility Is an Important Value
(§§ 81.400 - 81.437)
Subpart E—Identification of Interstate Transport Regions
(§§ 81.455 - 81.457)
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