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32 Coal
(CO
2
) is formed by the combination of carbon from the coal and oxygen from the air.
The other oxides form in a similar way. There are also ash particles that are very small
and fly out with the gas emissions, as well as heavier particles that fall into a collection
area. Fly ash can be caught by devices called electrostatic precipitators. They use static
An emissions scrubber at a coal-fired plant in North Carolina.