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Question
The atmosphere of big cities is polluted most by ______.
Options
automobile exhausts
pesticides
household waste
radioactive fall out
MCQ
Fill in the Blanks
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Solution
The atmosphere of big cities is polluted most by automobile exhausts.
Explanation:
Automobile exhausts release pollutants such as carbon monoxide, nitrogen oxides and hydrocarbons into the atmosphere. Since cities have a large number of vehicles, automobile exhausts are a major source of air pollution.
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