Which one of the following is not a pollution?
Correct answer: A. CO2
- A. CO2
- B. NO2
- C. CO
- D. SO2
Explanation
While carbon dioxide is a greenhouse gas and contributes to climate change, it is not typically classified as a pollutant in the traditional sense. It is a natural component of Earth's atmosphere and is essential for photosynthesis, which is the process that plants use to produce oxygen.
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About Environmental Chemistry
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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