Choose the compound that is always present in photochemical smog:
Correct answer: A. O3
- A. O3
- B. CO
- C. CO2
- D. SO2
Explanation
Photochemical smog is characterized by its high concentration of oxidants, the most abundant of which is ozone (O3). This ground-level ozone is formed from the reaction of nitrogen oxides and volatile organic compounds 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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