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This category of air pollutants is emitted directly from identifiable sources and pollutes the air immediately upon being emitted.


A) tertiary pollutants
B) quaternary pollutants
C) secondary pollutants
D) primary pollutants

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The primary purpose of a smokestack is to:


A) burn off inversion layers.
B) promote adiabatic cooling of the smoke.
C) reduce the concentration of pollutants at ground level.
D) change the lapse rate.

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The largest single air pollutant (in terms of the quantity emitted each year) is carbon monoxide.

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Rain is naturally somewhat acidic.

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The term "smog" originally referred to a mixture of smoke and fog.

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Generally, the greater the mixing depth, the better the air quality.

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Forest fires triggered by lightning are one of many natural sources of air pollution.

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