General principles guiding interpretation and application of the Clean Air Act.

Sierra Club v. EPA, 325 F.3d 374, 383 (D.C. Cir. 2003).The listing of hazardous air pollutants under the hazardous air pollutants program for stationary sources (CAA § 112, 42 USC § 7412) is for the purpose of the hazardous air pollutants program alone and has no bearing on which substances are included in the provision on mobile sources.

United States v. Ho, 311 F.3d 589, 604 (5th Cir. 2002).CAA §§ 112(h) & 114(a), 42 USC §§ 7412(h) & 7414(a), in authorizing the work practice standard for asbestos, and the work practice standard itself, are constitutional exercises of the Commerce Clause power.

BCCA Appeal Group v. EPA, 355 F.3d 817, 848 (5th Cir. 2003).EPA may exclude control measures that are not economically feasible on the grounds that they are not RACM.