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Clean Air Act Text | US EPA
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class="l-sidebar l-sidebar--reversed"> <div class="l-sidebar__main"> <article class="article" lang="en"> <h1 class="page-title"> Clean Air Act Text </h1> <div class="u-hide-for-print js-toggle-admin-content"> <div data-drupal-messages-fallback class="hidden"></div> </div> <div> <div> <div class="box box--related-info u-align-right"> <div class="box__title">Links to Regulations</div> <div class="box__content"> <ul> <li>Find regulations: <ul> <li><a href="/regulatory-information-topic">by topic</a></li> <li><a href="/regulatory-information-sector">by business sector</a></li> </ul> </li> <li>General Information about <a href="/laws-regulations/basics-regulatory-process">EPA Regulatory Development</a></li> <li>Federal Register Notices are available at <a href="https://www.federalregister.gov/">Federal Register Online</a></li> <li>EPA posts proposed and final rules at <a href="https://www.regulations.gov/">regulations.gov</a></li> <li>Air & Radiation <a href="/regulatory-information-topic/regulatory-and-guidance-information-topic-air">Regulations and Statutes</a></li> </ul> </div> </div><p><strong>On this page:</strong></p><ul> <li><a href="#what">What is the Clean Air Act?</a></li> <li><a href="#toc">Clean Air Act Table of Contents by Title</a></li> </ul><p><a id="what" name="what"></a></p><h2>What is the Clean Air Act?</h2><p>The Clean Air Act is the law that defines EPA's responsibilities for protecting and improving the nation's air quality and the stratospheric ozone layer. The last major change in the law, the Clean Air Act Amendments of 1990, was enacted by Congress in 1990. Legislation passed since then has made several minor changes.</p><p>The Clean Air Act, like other laws enacted by Congress, was incorporated into the <a href="https://uscode.house.gov/">United States Code</a> as Title 42, Chapter 85. The House of Representatives maintains a current version of the U.S. Code, which includes Clean Air Act changes enacted since 1990.</p><p>This site provides links to sections of the U.S. Code containing the amended text of the Clean Air Act. Section numbers in the U.S. Code are different than the Clean Air Act's section numbers. The table of contents below gives corresponding section numbers in the Clean Air Act (CAA) and the U.S. Code (USC). Another difference is that <em>titles</em> in the Clean Air Act correspond to <em>subchapters</em> in the U.S. Code. </p><p> </p><figure class="figure figure--medium"> <div class="figure__media"> <img loading="eager" srcset="/sites/default/files/styles/small/public/2015-06/banner.jpg?itok=ZA_-60yx 320w, /sites/default/files/styles/medium/public/2015-06/banner.jpg?itok=ea64JXlG 489w" sizes="(max-width: 640px) calc(100vw - 4rem), 640px" width="489" height="109" src="/sites/default/files/styles/medium/public/2015-06/banner.jpg?itok=ea64JXlG" alt="Image of air pollution from various sources"> </div> </figure> <p><a id="toc" name="toc"></a></p><h2>Clean Air Act Table of Contents by Title</h2><ul> <li><a href="/clean-air-act-overview/clean-air-act-title-i-air-pollution-prevention-and-control-parts-through-d">Title I - Air Pollution Prevention and Control</a> <ul> <li><a href="/clean-air-act-overview/clean-air-act-title-i-air-pollution-prevention-and-control-parts-through-d#ia">Part A - Air Quality and Emission Limitations</a> (CAA § 101-131; USC § 7401-7431 )</li> <li><a href="/clean-air-act-overview/clean-air-act-title-i-air-pollution-prevention-and-control-parts-through-d#ib">Part B - Ozone Protection</a> (replaced by Title VI)</li> <li><a href="/clean-air-act-overview/clean-air-act-title-i-air-pollution-prevention-and-control-parts-through-d#ic">Part C - Prevention of Significant Deterioration of Air Quality</a> (CAA § 160-169b; USC § 7470-7492)</li> <li><a href="/clean-air-act-overview/clean-air-act-title-i-air-pollution-prevention-and-control-parts-through-d#id">Part D - Plan Requirements for Nonattainment Areas</a> (CAA § 171-193; USC § 7501-7515)</li> </ul> </li> <li><a href="/clean-air-act-overview/clean-air-act-title-ii-emission-standards-moving-sources-parts-through-c">Title II - Emission Standards for Moving Sources</a> <ul> <li><a href="/clean-air-act-overview/clean-air-act-title-ii-emission-standards-moving-sources-parts-through-c#iia">Part A - Motor Vehicle Emission and Fuel Standards</a> (CAA § 201-219; USC § 7521-7554)</li> <li><a href="/clean-air-act-overview/clean-air-act-title-ii-emission-standards-moving-sources-parts-through-c#iib">Part B - Aircraft Emission Standards</a> (CAA § 231-234; USC § 7571-7574)</li> <li><a href="/clean-air-act-overview/clean-air-act-title-ii-emission-standards-moving-sources-parts-through-c#iic">Part C - Clean Fuel Vehicles</a> (CAA § 241-250; USC § 7581-7590)</li> </ul> </li> <li><a href="/clean-air-act-overview/clean-air-act-title-iii-general-provisions">Title III - General</a> (CAA § 301-328; USC § 7601-7627)</li> <li><a href="/clean-air-act-overview/clean-air-act-title-iv-noise-pollution">Title IV - Noise Pollution</a> (USC § 7641-7642). <em><a href="#noise">See Note below</a></em>.</li> <li><a href="/clean-air-act-overview/clean-air-act-title-iv-subchapter-acid-deposition-control">Title IV-A - Acid Deposition Control</a> (CAA § 401-416; USC § 7651-7651o) <em><a href="#noise">See Note below</a></em>.</li> <li><a href="/clean-air-act-overview/clean-air-act-title-v-permits">Title V - Permits</a> (CAA § 501-507; USC § 7661-7661f )</li> <li><a href="/clean-air-act-overview/clean-air-act-title-vi-stratospheric-ozone-protection">Title VI - Stratospheric Ozone Protection</a> (CAA § 601-618; USC § 7671-7671q )</li> </ul><hr><p><a id="noise" name="noise"></a>Note: <em>The 1990 Clean Air Act Amendments added a new title IV, relating to acid deposition control, without repealing the existing title IV, relating to noise pollution. The U.S. Code designates the <a href="https://www.govinfo.gov/content/pkg/USCODE-2013-title42/html/USCODE-2013-title42-chap85-subchapIV.htm">original title IV</a>, noise pollution, as subchapter IV and the new title IV, acid deposition control, as subchapter IV-A.</em></p> </div> </div> </article> </div> <div class="l-sidebar__sidebar"> <div class="menu-sidenav__overlay"></div> <div id="block-webareamenu" class="block--web-area-menu block"> <h2 class="block__title"><a href="/clean-air-act-overview" hreflang="en">Clean Air Act Overview</a></h2> <div class="block__content"> <button type="button" class="usa-button usa-button--outline web-area-menu__button" id="web-area-menu__button" aria-label="toggle the side navigation menu"> <svg class="usa-icon menu-button--open" aria-hidden="true" role="img"><title>Open Sidenav Menu</title><use href="/themes/epa_theme/images/sprite.svg#menu"></use></svg> <svg class="usa-icon menu-button--close" aria-hidden="true" role="img"><title>Close Sidenav 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