2WAP

Primary and secondary

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#2
A primary air pollutant is one that is emitted directly to the air from a given source,such as the carbon monoxide produced as a byproduct of combustion,whereas a secondary air pollutant is formed in the atmosphere through chemical reactions involving primary air pollutants....
#3
Amela: A primary air pollutant is one that is emitted directly to the air from a given source,such as the carbon monoxide produced as a byproduct of combustion,whereas a secondary air pollutant is formed in the atmosphere through chemical reactions involving primary air pollutants....
agree

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