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O3

EPA Terms of Environment Dictionary
Found in two layers of the atmosphere, the stratosphere and the troposphere. In the stratosphere (the atmospheric layer 7 to 10 miles or more above the earth's surface) ozone is a natural form of oxygen that provides a protective layer shielding the earth from ultraviolet radiation.In the troposphere (the layer extending up 7 to 10 miles from the earth's surface), ozone is a chemical oxidant and major component of photochemical smog. It can seriously impair the respiratory system and is one of the most wide- spread of all the criteria pollutants for which the Clean Air Act required EPA to set standards. Ozone in the troposphere is produced through complex chemical reactions of nitrogen oxides, which are among the primary pollutants emitted by combustion sources; hydrocarbons, released into the atmosphere through the combustion, handling and processing of petroleum products; and sunlight.
Provided as a public service by the U.S. Environmental Protection Agency
EPA Glossary of Climate Change Terms
A colorless gas with a pungent odor, having the molecular form of O3 , found in two layers of the atmosphere, the stratosphere (about 90% of the total atmospheric loading) and the troposphere (about 10%). Ozone is a form of oxygen found naturally in the stratosphere that provides a protective layer shielding the Earth from ultraviolet radiation's harmful health effects on humans and the environment. In the troposphere, ozone is a chemical oxidant and major component of photochemical smog. Ozone can seriously affect the human respiratory system. See atmosphereultraviolet radiation.
 
See ozone.
Provided as a public service by the U.S. Environmental Protection Agency. Reference list click here.
Environmental Engineering Dictionary
Ozone

 

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Earth911.org Environmental Glossary

INforEEP Environmental Glossary

NRDC Glossary of Environmental Terms

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United Nations Environment Programme

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World Wildlife Fund

GreenNet


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