Browse Federal regulations

Read the original sections, or search by topic.

40 CFR 51.241 · Nonattainment areas for carbon monoxide and ozone.
40 CFR 51.242 · [Reserved]
40 CFR 51.260 · Legally enforceable compliance schedules.
40 CFR 51.261 · Final compliance schedules.
40 CFR 51.262 · Extension beyond one year.
40 CFR 51.280 · Resources.
40 CFR 51.281 · Copies of rules and regulations.
40 CFR 51.285 · Public notification.
40 CFR 51.286 · Electronic reporting.
40 CFR 51.300 · Purpose and applicability.
40 CFR 51.301 · Definitions.
40 CFR 51.302 · Reasonably attributable visibility impairment.
40 CFR 51.303 · Exemptions from control.
40 CFR 51.304 · Identification of integral vistas.
40 CFR 51.305 · Monitoring for reasonably attributable visibility impairment.
40 CFR 51.306 · [Reserved]
40 CFR 51.307 · New source review.
40 CFR 51.308 · Regional haze program requirements.
40 CFR 51.309 · Requirements related to the Grand Canyon Visibility Transport Commission.
40 CFR 51.320 · Annual air quality data report.
40 CFR 51.321 · Annual source emissions and State action report.
40 CFR 51.322 · Sources subject to emissions reporting.
40 CFR 51.323 · Reportable emissions data and information.
40 CFR 51.324 · Progress in plan enforcement.
40 CFR 51.326 · Reportable revisions.
40 CFR 51.327 · Enforcement orders and other State actions.
40 CFR 51.328 · [Reserved]
40 CFR 51.341 · Request for 18-month extension.
40 CFR 51.350 · Applicability.
40 CFR 51.351 · Enhanced I/M performance standard.
40 CFR 51.352 · Basic I/M performance standard.
40 CFR 51.353 · Network type and program evaluation.
40 CFR 51.354 · Adequate tools and resources.
40 CFR 51.355 · Test frequency and convenience.
40 CFR 51.356 · Vehicle coverage.
40 CFR 51.357 · Test procedures and standards.
40 CFR 51.358 · Test equipment.
40 CFR 51.359 · Quality control.
40 CFR 51.360 · Waivers and compliance via diagnostic inspection.
40 CFR 51.361 · Motorist compliance enforcement.
40 CFR 51.362 · Motorist compliance enforcement program oversight.
40 CFR 51.363 · Quality assurance.
40 CFR 51.364 · Enforcement against contractors, stations and inspectors.
40 CFR 51.365 · Data collection.
40 CFR 51.366 · Data analysis and reporting.
40 CFR 51.367 · Inspector training and licensing or certification.
40 CFR 51.368 · Public information and consumer protection.
40 CFR 51.369 · Improving repair effectiveness.
40 CFR 51.370 · Compliance with recall notices.
40 CFR 51.371 · On-road testing.
40 CFR 51.372 · State Implementation Plan submissions.
40 CFR 51.373 · Implementation deadlines.
40 CFR Appendix A to Subpart S of Part 51 · Appendix A to Subpart S of Part 51—Calibrations, Adjustments and Quality Control
40 CFR Appendix B to Subpart S of Part 51 · Appendix B to Subpart S of Part 51—Test Procedures
40 CFR Appendix C to Subpart S of Part 51 · Appendix C to Subpart S of Part 51—Steady-State Short Test Standards
40 CFR Appendix D to Subpart S of Part 51 · Appendix D to Subpart S of Part 51—Steady-State Short Test Equipment
40 CFR Appendix E to Subpart S of Part 51 · Appendix E to Subpart S of Part 51—Transient Test Driving Cycle
40 CFR 51.390 · Implementation plan revision.
40 CFR 51.490 · Applicability.
40 CFR 51.491 · Definitions.
40 CFR 51.492 · State program election and submittal.
40 CFR 51.493 · State program requirements.
40 CFR 51.494 · Use of program revenues.
40 CFR 51.850 · [Reserved]
40 CFR 51.851 · State implementation plan (SIP) or Tribal implementation plan (TIP) revision.
40 CFR 51.852-51.860 · §§ 51.852-51.860 [Reserved]
40 CFR 51.900 · Definitions.
40 CFR 51.901 · Applicability of part 51.
40 CFR 51.902 · Which classification and nonattainment area planning provisions of the CAA shall apply to areas designated nonattainment for the 1997 8-hour NAAQS?
40 CFR 51.903 · How do the classification and attainment date provisions in section 181 of subpart 2 of the CAA apply to areas subject to § 51.902(a)?
40 CFR 51.904 · How do the classification and attainment date provisions in section 172(a) of subpart 1 of the CAA apply to areas subject to § 51.902(b)?
40 CFR 51.905 · How do areas transition from the 1-hour NAAQS to the 1997 8-hour NAAQS and what are the anti-backsliding provisions?
40 CFR 51.906 · Redesignation to nonattainment following initial designations for the 8-hour NAAQS.
40 CFR 51.907 · For an area that fails to attain the 8-hour NAAQS by its attainment date, how does EPA interpret sections 172(a)(2)(C)(ii) and 181(a)(5)(B) of the CAA?
40 CFR 51.908 · What modeling and attainment demonstration requirements apply for purposes of the 8-hour ozone NAAQS?
40 CFR 51.909 · [Reserved]
40 CFR 51.910 · What requirements for reasonable further progress (RFP) under sections 172(c)(2) and 182 apply for areas designated nonattainment for the 8-hour ozone NAAQS?
40 CFR 51.911 · [Reserved]
40 CFR 51.912 · What requirements apply for reasonably available control technology (RACT) and reasonably available control measures (RACM) under the 8-hour NAAQS?
40 CFR 51.913 · How do the section 182(f) NOX exemption provisions apply for the 8-hour NAAQS?
40 CFR 51.914 · What new source review requirements apply for 8-hour ozone nonattainment areas?
40 CFR 51.915 · What emissions inventory requirements apply under the 8-hour NAAQS?
40 CFR 51.916 · What are the requirements for an Ozone Transport Region under the 8-hour NAAQS?
40 CFR 51.917 · What is the effective date of designation for the Las Vegas, NV, 8-hour ozone nonattainment area?
40 CFR 51.918 · Can any SIP planning requirements be suspended in 8-hour ozone nonattainment areas that have air quality data that meets the NAAQS?
40 CFR 51.919 · Applicability.
40 CFR 51.930 · Mitigation of Exceptional Events.
40 CFR 51.1000 · Definitions.
40 CFR 51.1001 · Applicability of part 51.
40 CFR 51.1002 · Classifications and reclassifications.
40 CFR 51.1003 · Attainment plan due dates and submission requirements.
40 CFR 51.1004 · Attainment dates.
40 CFR 51.1005 · Attainment date extensions.
40 CFR 51.1006 · Optional PM2.5 precursor demonstrations
40 CFR 51.1007 · [Reserved]
40 CFR 51.1008 · Emissions inventory requirements.
40 CFR 51.1009 · Moderate area attainment plan control strategy requirements.
40 CFR 51.1010 · Serious area attainment plan control strategy requirements.
40 CFR 51.1011 · Attainment demonstration and modeling requirements.
40 CFR 51.1012 · Reasonable further progress (RFP) requirements.