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What is the difference between Primary and Secondary air pollutants?

April 26, 2017air difference pollutants primary Secondary

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What is the difference between Primary and Secondary air pollutants?

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Primary pollutants (eg. carbon monoxide from vehicular exhausts) are emitted directly from their sources of emission. Secondary pollutants are those that are formed from other primary pollutants after they have been emitted into the environment (either by condensation, decomposition or chemical reaction).