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X and the City by John A. Adam

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Chapter 19

AIR POLLUTION IN THE CITY

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I spent several years as a student living in London, but fortunately I never had to experience something that plagued the city in the first half of the twentieth century: smog ( = smoke + fog). The last major occurrence of London smog was in 1952, and while estimates vary, it is thought that as many as 12,000 people died in the weeks and months following the outbreak. Basically, smog is caused by the chemical reaction of sunlight with chemicals in the atmosphere.

But more generally, what is air pollution? Essentially, it is the presence of substances in the atmosphere that can adversely affect the quality ...

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