Question

secondary pollutants are produced when primary pollutants are released and undergo chemical reactions. which of the following is an example of a secondary pollutant?
oxygen
photochemical smog
carbon
hydrogen

Explanation:

1. Analyze each option:

• Oxygen: A naturally occurring gas, not a pollutant (primary or secondary) in the context of pollution from chemical reactions of primary pollutants.
• Photochemical smog: Formed when primary pollutants (like nitrogen oxides and volatile organic compounds) undergo chemical reactions in the presence of sunlight. So it's a secondary pollutant.
• Carbon: Usually exists as primary pollutants (like carbon monoxide, particulate carbon) from direct emissions, not formed from reactions of other pollutants.
• Nitrogen: A natural gas, not a pollutant formed from reactions of primary pollutants.

Answer:

B. photochemical smog