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Ground-level Ozone Pollution | US EPA
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Since it forms from emissions of volatile organic compounds (VOCs) and nitrogen oxides (NOx), these pollutants are regulated under air quality standards." /> <meta property="DC.Subject.epachannel" content="Laws & Regulations, Learn the Issues" /> <meta property="DC.type" content="Other Policies and Guidance" /> <meta property="DC.date.created" content="2015-05-15" /> <meta property="DC.date.modified" content="2025-03-26" /> <meta property="DC.date.reviewed" content="2025-06-24" /> <meta property="DC.creator" content="US EPA,OAR" /> <meta property="DC.language" content="en" /> <meta property="WebArea" content="Ground-level Ozone Pollution" /> <meta property="ContentType" content="Web Area Homepage" /> <meta property="NavigationStyle" content="sidebar_navigation" /> <meta property="og:site_name" content="US EPA" /> <meta property="og:type" content="Web Area Homepage" /> <meta property="og:url" content="https://www.epa.gov/ground-level-ozone-pollution" /> <meta property="og:title" content="Ground-level Ozone Pollution | US EPA" /> <meta property="og:description" content="Known as tropospheric or "ground-level" ozone, this gas is harmful to human heath and the environment. Since it forms from emissions of volatile organic compounds (VOCs) and nitrogen oxides (NOx), these pollutants are regulated under air quality standards." /> <meta property="og:image" content="https://www.epa.gov/sites/all/themes/epa/img/epa-standard-og.jpg" /> <meta property="og:image:width" content="1200" /> <meta property="og:image:height" content="630" /> <meta property="og:updated_time" content="2025-03-26" /> <meta property="og:image:alt" content="U.S. Environmental Protection Agency" /> <meta property="og:country_name" content="United States of America" /> <meta property="article:published_time" content="2015-05-15T13:04:31-04:00" /> <meta property="article:modified_time" content="2025-03-26" /> <meta name="twitter:card" content="summary_large_image" /> <meta name="twitter:description" content="Known as tropospheric or "ground-level" ozone, this gas is harmful to human heath and the environment. 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</div> <article class="article"> <h1 class="page-title"> Ground-level Ozone Pollution </h1> <div class="js-toggle-admin-content"> <div data-drupal-messages-fallback class="hidden"></div> </div> <div class="hero-slideshow js-hero-slideshow u-full-width"> <ul class="hero-slideshow__list js-hero-slideshow__container"> <li class="hero-slideshow__item"> <section class="usa-hero usa-hero--slideshow usa-hero--reversed" style="background-image:url(/sites/default/files/styles/hero/public/images/banners/2021-07/ozone_banner1_1_1.jpg?h=23ee108b&itok=gePPMK3S)"> <div class="grid-container"> <div class="usa-hero__callout usa-dark-background"> <h2 class="usa-hero__heading"> Announcements </h2> <p>12/20/2024 - EPA releases <a href="/naaqs/ozone-o3-standards-planning-documents-current-review">Volumes 1 and 2 of the Integrated Review Plan</a> for the current review of the Ozone National Ambient Air Quality Standards.</p> </div> </div> </section> </li> </ul> <div class="hero-slideshow__nav"> <div class="l-constrain js-hero-slideshow__nav"><button type="button" class="hero-slideshow__nav-button">1</button></div> </div> </div> <div> <div > <div class="box box--related-info "> <p>Ozone can be “good” or “bad” for health and the environment depending on where it’s found in the atmosphere. <a href="/ozone-layer-protection">Stratospheric ozone</a> is “good” because it protects living things from ultraviolet radiation from the sun. Ground-level ozone, the topic of this website, is “bad” because it can trigger a <a href="/ozone-pollution/health-effects-ozone-pollution">variety of health problems</a>.</p> <p>EPA regulations help states reduce ozone levels in outdoor air. <a href="/ozone-pollution/basic-information-about-ozone#effects">Learn more about ground-level ozone</a><a href="/ground-level-ozone-pollution/ground-level-ozone-basics">.</a></p> </div> </div> </div> <div class="usa-section"> <div class="l-constrain"> <div class="l-grid l-grid--3-col l-column-layout"> <div> <div class="box"> <h2 class="box__title"> Ground-level Ozone Basics </h2> <div class="box__content"> <ul> <li><a href="/ground-level-ozone-pollution/ground-level-ozone-basics#wwh">What is “good” vs. “bad” ozone?</a></li> <li><a href="/ground-level-ozone-pollution/ground-level-ozone-basics#formation">How does ground-level ozone form?</a></li> <li><a href="/ground-level-ozone-pollution/ground-level-ozone-basics#effects">What are the harmful effects of ozone?</a></li> <li><a href="/ground-level-ozone-pollution/ground-level-ozone-basics#regulations">What is being done to reduce ozone pollution?</a></li> </ul> </div> </div> </div> <div> <div class="box"> <h2 class="box__title"> Setting and Reviewing the Standards </h2> <div class="box__content"> <ul> <li><a href="/ozone-pollution/setting-and-reviewing-standards-control-ozone-pollution#standards">What are ozone standards?</a></li> <li><a href="/ozone-pollution/setting-and-reviewing-standards-control-ozone-pollution#review">How are they developed and reviewed?</a></li> <li><a href="/ozone-pollution/setting-and-reviewing-standards-control-ozone-pollution#technical">What scientific and technical information supports reviews?</a></li> </ul> </div> </div> </div> <div> <div class="box"> <h2 class="box__title"> Implementing the Standards </h2> <div class="box__content"> <ul> <li><a href="/ozone-designations">How is an area designated attainment (meeting) or nonattainment (not meeting) the ozone standard?</a></li> <li><a href="/ozone-pollution/applying-or-implementing-ozone-standards">How are the ozone standards implemented?</a></li> <li><a href="/air-quality-implementation-plans/approved-air-quality-implementation-plans">What are air quality implementation plans and how are they developed?</a></li> <li><a href="/ground-level-ozone-pollution/volatile-organic-compound-exemptions">What are the Ozone VOC Exemptions?</a></li> </ul> </div> </div> </div> </div> </div> </div> <div class="usa-section"> <div class="l-constrain"> <div class="l-grid l-grid--2-col l-column-layout"> <div> <div class="box box--highlight"> <h2 class="box__title"> Air Quality Where You Live </h2> <div class="box__content"> <ul> <li>View current and forecasted air quality conditions across the U.S.</li> <li>Explore current locations of wildfires</li> <li>Review data from air quality monitors across the world</li> </ul> <p><a href="https://www.airnow.gov/">Visit AirNow.gov</a></p> 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