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What is the main cause of increase in air pollution in the 20th century?

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What is the main cause of increase in air pollution in the 20th century?

(a) Development of the transport system

(b) Development of infrastructures

(c) Development of electricity

(d) Development of water resources

I had been asked this question in a job interview.

This intriguing question comes from History, Types and Sources of Air pollution’s topic in portion Environmental Pollution of Energy Management

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Best answer
Right choice is (a) Development of the transport system

Best explanation: In 20th-century air pollution began to increase with the development of transportation systems and the large scale use of petrol and diesel usage. Pollution due to auto exhaust is a serious environmental issue.

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