U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 21, 2026

All TitlesTitle 40Chapter IPart 51Subpart G - Subpart G—Control Strategy
§ 51.110 - Attainment and maintenance of national standards.
§ 51.111 - Description of control measures.
§ 51.112 - Demonstration of adequacy.
§ 51.113 - [Reserved]
§ 51.114 - Emissions data and projections.
§ 51.115 - Air quality data and projections.
§ 51.116 - Data availability.
§ 51.117 - Additional provisions for lead.
§ 51.118 - Stack height provisions.
§ 51.119 - Intermittent control systems.
§ 51.120 - Requirements for State Implementation Plan revisions relating to new motor vehicles.
§ 51.121 - Findings and requirements for submission of State implementation plan revisions relating to emissions of nitrogen oxides.
§ 51.122 - Emissions reporting requirements for SIP revisions relating to budgets for NOX emissions.
§ 51.123 - Findings and requirements for submission of State implementation plan revisions relating to emissions of oxides of nitrogen pursuant to the Clean Air Interstate Rule.
§ 51.124 - Findings and requirements for submission of State implementation plan revisions relating to emissions of sulfur dioxide pursuant to the Clean Air Interstate Rule.
§ 51.125 - [Reserved]
§ 51.126 - Determination of widespread use of ORVR and waiver of CAA section 182(b)(3) Stage II gasoline vapor recovery requirements.
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