Question

why level of air pollution is higher in metro cities ?
Any irrelevant answers shall be reported...

Answer 1

The process of urbanization and industrialization during las two decades has resulted in increased level of air pollution causing hazards to human health. ... SPM levels in fugitive dust of the two industrial surroundings are higher by an order of magnitude compared to ambient air.

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Answer 2

The level of air pollution is high in metro cities like delhi , mumbai , kolkata and Chennai because of the following reasons :

1) Due to the heavy volume of traffic

2) People use more no: of vehicles

3) Can use cycles to reduce pollution