| Particulate Matter - PM |
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| • | Products
of combustion, atmospheric reactions, |
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| and
mechanical processes |
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| • | Wide
range of particle sizes |
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| • | Wide
range of physical/chemical properties |
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| • | Wide
range of health impacts, including |
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| premature
death |
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| • | Control
by filtration, electrostatic |
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| precipitation,
and reduction of precursor gases |
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