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Ground-level Ozone


The following are additional resources and web sites that address ground level ozone. They include sites from the EPA, state, tribal and local agencies, and partner organizations.


  • AIRNow Health Providers Information Provides information on how to help patients protect their health by reducing their exposure to air pollution.

  • EPA's Air Quality Guide for Ozone Provides detailed information about what the Air Quality Index means.  Helps determine ways to protect your family's health when ozone levels reach the unhealthy range, and ways you can help reduce ozone air pollution.

  • EPA’s Asthma Web Site EPA's Communities in Action Asthma Initiative is a coordinated effort to reduce the burden of asthma and includes programs to address indoor and outdoor environments that cause, trigger or exacerbate asthma symptoms.

  • Ozone: Good Up High, Bad Nearby (PDF) (2 pp, 1.3 MB) Ozone acts as a protective layer high above the earth, but it can be harmful to breathe. This publication provides basic information about ground level and high-altitude ozone.

  • Ozone and Your Health (PDF) (2 pp, 2.5 MB) This short, colorful pamphlet tells who is at risk from exposure to ozone, what health effects are caused by ozone, and simple measures that can be taken to reduce health risk.

  • Ozone and Your Patients' Health Training for Health Care Providers Designed for family practice doctors, pediatricians, nurse practitioners, asthma educators, and other medical professionals who counsel patients about asthma and respiratory symptoms.

  • Smog - Who Does it Hurt? (PDF) (10 pp, 819 KB) This 8-page booklet provides more detailed information than "Ozone and Your Health" about ozone health effects and how to avoid them.

  • Summertime Safety: Keeping Kids Safe from Sun and Smog (PDF) (2 pp, 314 KB) This document discusses summer health hazards that pertain particularly to children and includes information about EPA's Air Quality Index and UV Index tools.

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  • Ozone Air Quality Designations Provides information on the process EPA, the states, and the tribes follow to designate areas as "attainment" (meeting) or "nonattainment" (not meeting) the ground level ozone standards

  • Ozone Air Quality Standards EPA has developed two types of national air quality standards for ground level ozone.

  • Acid Rain Program Uses a combination of traditional requirements and a market-based cap and trade program to reduce power plant emissions of nitrogen oxides (NOx) and sulfur dioxide (SO2), which contribute to ground level formation.

  • Cross- State Air Pollution Rule (2011) Requires 27 states to significantly improve air quality by reducing power plant emissions that contribute to ozone and/or fine particle pollution in other states.

  • General Conformity Under the General Conformity Rule, federal agencies must work with State, Tribal and local governments in a nonattainment or maintenance area to ensure that federal actions conform to the air quality plans established in the applicable state or tribal implementation plan.

  • Regional Transport Rule (1998) Reduces regional emissions of nitrogen oxides (NOx) in 22 states and the District of Columbia, and in turn, reduces the regional transport of ozone.

  • Section 126 Petitions (1999) In response to comments, EPA made available unit-specific information on heat input and electric generation from large boilers and turbines in the NOX State Implementation Plan (SIP) Call region, including 22 States and the District of Columbia.

  • Tier 2 Vehicle Emission Standards and Gasoline Sulfur Program treats all passenger vehicles and the fuels they use as a system, setting tailpipe emissions standards for all passenger vehicle beginning with the 2004 model year, and requiring reduced levels of sulfur in gasoline.

  • The 2004 Clean Air Nonroad Diesel Rule Established emission standards for the engines used in most construction, agricultural, and industrial equipment, and reduces the amount of sulfur allowed in the fuel they use.

  • The 2007 Clean Diesel Trucks and Buses Rule Requires the cleanest running heavy-duty trucks and buses in history on America’s roads, building a fleet that will be 95 percent cleaner than today’s trucks and buses.

  • The 2008 Locomotive and Marine Diesel Engines Emission Standards Reduces emissions of diesel particulate matter (PM) and nitrogen oxide (NOx) from locomotives and marine diesel engines.

  • Transportation ConformityProvides access to information on EPA's transportation conformity program

  • Emissions standards for highway motorcycles along with standards for engines that power forklifts, electric generators, recreational boat engines, snowmobiles, all-terrain vehicles and offroad motorbikes.

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  • Air Quality Criteria Document for Ozone (February 2006): This comprehensive assessment of scientific data about the health and environmental effects of ground level ozone is an important part of EPA’s review of its ozone standards.

  • Air Quality Monitoring Contains information on ambient air quality monitoring programs, monitoring methods, quality assurance and control procedures, and federal regulations related to ambient air quality monitoring.

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  • NAAQS Standards Chart EPA’s Office of Air Quality Planning and Standards (OAQPS) establishes National Ambient Air Quality Standards for six principal pollutants, which are called "criteria" pollutants.

  • Technical Information EPA's technical information that helps establish the ozone standards.

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  • Air Now Provides daily AQI forecasts as well as real-time AQI conditions for over 300 cities across the US, and provides links to more detailed State and local air quality Web sites.

  • AIRNow Kids' Provides games and activities for children of all ages, teachers and parents.

  • Air Quality Index The AQI is an index for reporting daily air quality. It tells you how clean or polluted your air is, and what associated health effects might be a concern for you.

  • EnviroFlash Provides a free service that alerts you via email when your local air quality is a concern.

  • EPA's Climate Change Web site Provides information on climate change for communities, individuals, businesses, states, localities and governments.

  • EPA's Heat Island Effect Includes a compendium of mitigation strategies, a community action database, and regularly scheduled webcasts.

  • EPA's Visibility Web site The Regional Haze Rule calls for state and federal agencies to work together to improve visibility in 156 national parks and wilderness areas.

  • EPA's Stratospheric Ozone Web site Provides information related to the science of ozone depletion, EPA's regulatory approach to protecting the ozone layer, alternatives to ozone-depleting substances, and sun safety.

  • Plain English Guide for the Clean Air Act Provides a brief introduction to the 1990 Clean Air Act.

  • School Flag Program The School Flag Program helps children, parents, school personnel and the community be aware of daily air quality conditions using colored flags.

  • The Green Book Provides detailed information on the criteria pollutant nonattainment areas. 

  • Why is Coco Orange? This book is for all children, especially those with asthma, and their caretakers. Ages 4-8.

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