Question

which pollutants are emitted directly into the air? secondary pollutants pans ozones primary pollutants

Explanation:

Primary pollutants are pollutants that are emitted directly into the atmosphere from sources. Secondary pollutants form in the atmosphere through reactions of primary pollutants. PANs (Peroxyacetyl nitrates) and ozone are secondary pollutants. So the pollutants emitted directly into the air are primary pollutants.

Answer:

D. Primary pollutants