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Pollution of Air and Water — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8SciencePollution of Air and Water1 Mark
Question
The level of air pollution is higher at a busy traffic intersection. Why?
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Answer

A large number of automobiles stop for a short period at red light throughout the day and release a large quantity of gases (due to burning of petrol and diesel) which create air pollution. Motor vehicles are the major cause of air pollution in big cities.

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