Pollutants that enter the atmosphere directly, for example from smokestacks and tail pipes, are called secondary air pollutants.

Name: Pollutants that enter the atmosphere directly, for example from smokestacks and tail pipes, are called secondary air pollutants.
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Pollutants that enter the atmosphere directly from sources such as smokestacks and tail pipes are called primary air pollutants. Secondary air pollutants are formed in the atmosphere through chemical reactions among primary pollutants.

Pollutants That Enter the Atmosphere Directly, for Example from Smokestacks