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Sources of Air Pollution
Air pollution consists of gas and particle contaminants
that are present in the atmosphere. Gaseous pollutants
include SO
2
, NO
x
, ozone, CO, volatile organic
compounds (VOCs), certain toxic air pollutants, and
some gaseous forms of metals. Particle pollution (PM
2.5
and PM
10
) includes a mixture of compounds. The
majority of these compounds can be grouped into five
categories: sulfate, nitrate, elemental (black) carbon,
organic carbon, and crustal material.
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