Regulations last checked for updates: Jan 18, 2025

Title 40 - Protection of Environment last revised: Dec 30, 2025

OVERVIEW AND APPLICABILITY
EMISSION STANDARDS AND RELATED REQUIREMENTS
CERTIFYING EMISSION FAMILIES
SPECIAL COMPLIANCE PROVISIONS
DEFINITIONS AND OTHER REFERENCE INFORMATION
authority: 42 U.S.C. 7414 and 7511b(e)
source: 64 FR 48815, Sept. 11, 1998, unless otherwise noted.