Question

compare primary and secondary pollutants. which is more harmful?

Explanation:

Primary pollutants are emitted directly (e.g., CO, SO₂). Secondary pollutants form in the atmosphere (e.g., ozone, acid rain components) via reactions of primary pollutants. Secondary pollutants are often more harmful as they can travel long distances, have complex toxic effects, and persist in the environment, affecting ecosystems and human health (e.g., ozone damages lungs, acid rain harms forests/aquatic life).

Answer:

Primary pollutants are directly emitted (e.g., CO, SO₂). Secondary pollutants form from primary pollutants’ reactions (e.g., ozone, acid rain). Secondary pollutants are generally more harmful due to long - range transport, complex toxicity, and environmental persistence (e.g., ozone lung damage, acid rain ecosystem harm).