This guide covers the Clean Air Act as it actually applies to facilities, from designation through enforcement. Part I sets out the statutory architecture and the ambient standards. Part II covers state implementation plans and interstate transport. Part III covers preconstruction permitting in attainment and nonattainment areas and the modification question. Part IV covers source-specific standards including hazardous air pollutants. Part V covers the operating permit program, potential to emit, and synthetic minor limits. Part VI covers monitoring, recordkeeping, reporting, and the compliance certification. Part VII covers enforcement, penalties, and citizen suits. Part VIII covers mobile sources, greenhouse gases, judicial review, and program design.