Programs: Air
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- Visibility Impairment - This site describes visibility impairment caused by air pollution in the United States. One of the most basic forms of air pollution - haze - degrades visibility in many American cities and scenic areas.
- Transportation & Air Quality - Provides links to information about air pollution from motor vehicles, boats and ships, trains, aircrafts, and the fuels that they use. You can also find out about travel choices that minimize emissions.
- PM 2.5 Designations - Particulate matter (PM) is the term for particles found in the air, including dust, dirt, soot, smoke, and liquid droplets. Fine particles are those less than 2.5 micrometers in diameter and are also referred to as PM2.5. This site provides links to information on health effects, nonattainment designations, and technical data on PM.
- Air Toxics - This site provides links to air toxics regulatory programs, air toxics planning/education/outreach programs, and the National Air Toxics Assessment (NATA).
- Clean Air Markets - EPA's Clean Air Markets programs include various market-based regulatory programs designed to improve air quality via cap-and-trade mechanisms. The most well-known of these programs is EPA's Acid Rain Program, which has the overall goal of achieving environmental and public health benefits through reductions in emissions of sulfur dioxide (SO2) and nitrogen oxides (NOx).
- Mercury - Mercury is a naturally occurring element that is present throughout the environment. Human activity can release some of that mercury into the air, water and soil. This site provides information on effects on health and wildlife, regulatory programs, and spill clean-up/waste disposal.
- Acid Rain - This section of the Web site provides information about acid rain's causes and effects, how we measure acid rain, and what is being done to solve the problem under EPA's Acid Rain Program.
- Radiation Protection - This site provides information about EPA's efforts to protect people and the environment from harmful and avoidable exposure to radiation.
- Climate Leaders - Climate Leaders is a voluntary industry- government partnership that encourages companies to develop long-term comprehensive climate change strategies and set greenhouse gas (GHG) emissions reduction goals.
- Ozone Depletion - Within this area you'll find information about the science of ozone depletion, information about the regulatory approach to protecting the ozone layer, and information on alternatives to ozone-depleting substances, as well as information on a number of other topics.
- 8-Hour Ground-level Ozone Designations - Ozone, the main ingredient of smog, presents a serious air quality problem in many parts of the United States. Even at low levels, ozone can cause a number of respiratory effects. This site provides links to information on health effects, nonattainment designations, and technical data on ozone.
- Indoor Air Quality (IAQ) - This site provides information about the sources and effects of indoor air quality problems in homes, schools, and offices, and provides information about EPA programs to help address these problems and avoid harmful exposures.
- National Ambient Air Quality Standards (NAAQS) - The Clean Air Act, which was last amended in 1990, requires EPA to set National Ambient Air Quality Standards for pollutants considered harmful to public health and the environment. EPA has set standards for six principal pollutants, which are called "criteria" pollutants, including ozone, particulate matter, sulfur dioxide, lead, carbon monoxide, and nitrogen dioxide. This site provides information on the standards and links to further information on each of the criteria pollutants.
- Air Permits - Operating permits are legally enforceable documents that permitting authorities issue to air pollution sources after the source has begun to operate. This Web site discusses the kind of operating permit (called a title V operating permit) that most large sources and some smaller sources of air pollution are required to obtain. This requirement comes from Title V of the Clean Air Act Amendments of 1990.
- New Source Review - Large new factories and modifications to existing factories that emit significant amounts of air pollution are required by the Clean Air Act to obtain New Source Review (NSR) permits. The goal of the NSR permit program is to ensure that areas of the country with poor air quality do not worsen and that clean air areas are kept clean. This site provides information on the NSR permit program.
- Technology Transfer Network - The Technology Transfer Network (TTN) is a collection of technical Web sites containing information about many areas of air pollution science, technology, regulation, measurement, and prevention. In addition, the TTN serves as a public forum for the exchange of technical information and ideas among participants and EPA staff.
Partners
- TribalAIR - The TribalAIR web site is designed to strengthen EPA and Tribal air quality programs in Indian Country
- State and Territorial Air Pollution Program Administrators - Association of Local Air Pollution Control Officials (STAPPA/ALAPCO) - This site is maintained by the State and Territorial Air Pollution Program Administrators and Association of Local Air Pollution Control Officials who represent the state and local air pollution control agencies in the U.S. These agencies partner with EPA to implement the various air pollution control and monitoring programs.
- Clean Air Act Advisory Committee (CAAAC) - A senior-level policy committee established in 1990 to advise the U.S. EPA on issues related to implementing the Clean Air Act Amendments of 1990.