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Biology, 30.08.2019 17:40 sarah1911

4) all of the following are sources of air pollution, except
a. chlorofluorocarbons (cfcs).
b. heavy metals such as mercury.
c. nitrogen oxides from automotive exhaust.
d. small particles of smoke and dust in smog.

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4) all of the following are sources of air pollution, except
a. chlorofluorocarbons (cfcs).

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