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 nitrogen

Explanation:

To determine the secondary pollutant, we analyze each option:

• Oxygen: It is a naturally occurring, essential gas, not a pollutant (primary or secondary).
• Photochemical smog: Formed when primary pollutants (like nitrogen oxides, volatile organic compounds) undergo chemical reactions (e.g., in sunlight), so it is a secondary pollutant.
• Carbon: In elemental form or simple compounds, it is often a primary pollutant source or not a pollutant in the context of this question's options.
• Nitrogen: In elemental form (N₂), it is a natural component of air, not a pollutant.

Answer:

B. photochemical smog (assuming the options are labeled as A. oxygen, B. photochemical smog, C. carbon, D. nitrogen)