Environmental Engineering Reference
In-Depth Information
Source: Environmental Protection Agency
Ozone (O 3 ) is a colorless gas found in both the stratosphere and the troposphere. "Good" ozone is located nat-
urally in the stratosphere and protects the Earth from excess levels of harmful ultraviolet radiation from the
sun. "Bad" ozone is located close to the ground in the troposphere. The main component of smog, ozone is cre-
ated at ground level when human-created nitrogen oxides (NO x ) react with volatile organic compounds
(VOCs) , sunlight, and heat. VOCs are highly reactive organic compounds and can be found in thousands of
products including dry-cleaning products, paint, cleaning supplies, varnishes, vehicle emissions, solvents, and
pesticides.
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