The main cause of pollution in metro cities is due to:
Correct answer: B. Automobiles
- A. Industries
- B. Automobiles
- C. Home fuel
- D. Trees
Explanation
Automobiles are a major source of urban air pollutants such as carbon monoxide, nitrogen oxides, hydrocarbons, and particulate matter because they operate throughout densely populated areas. Industrial emissions can also be important, but the usual metro-city answer is automobiles.
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