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X and the City by John A. Adam

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Chapter 20

LIGHT IN THE CITY

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With such particles suspended in the atmosphere for sometimes days or weeks at a time, smog presents a danger to health, but in London it was also known as a “pea souper” because one could not see one’s hand in front of one’s face! In fact, as a result of the Great London Smog of 1952 (caused by the smoke from millions of chimneys combined with the mists and fogs of the Thames valley), the Clean Air Act of 1956 was enacted. With this in mind we now turn to the topic of how air pollution may affect visibility.

X = Is: VISIBILITY IN THE CITY

We start with an apparent non sequitur by asking the following question. ...

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