Final answer:
Primary pollutants are directly discharged into the air and can form secondary pollutants when they react with other chemicals.
Explanation:
Primary pollutants are chemicals directly discharged into the air that have a direct impact on the environment. When these primary pollutants react with other chemicals in the air, they form secondary pollutants. Examples of primary pollutants include sulfur oxides, nitrogen oxides, carbon monoxide, and lead.
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