_ is a secondary pollutant.
Correct answer: C. PAN
- A. CO
- B. CO2
- C. PAN
- D. NO2
Explanation
A secondary pollutant is not emitted directly but forms in the atmosphere when primary pollutants react. Peroxyacetyl nitrate (PAN) is a key component of photochemical smog, formed from the reaction of hydrocarbons and nitrogen oxides in the presence of sunlight.
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Atmospheric pollution includes smog, acid rain, greenhouse gases, ozone depletion and the effects of carbon monoxide, sulfur oxides, nitrogen oxides and particulate matter. Water pollution covers sewage, industrial waste, eutrophication and treatment stages, while green chemistry focuses on reducing hazardous substances, waste and energy use through safer, more efficient processes.
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