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It's almost never foggy in London, except in the movies. The old London fogs were the result of millions of coal fires producing particles (smoke) which encouraged the formation of fog on cold, still, winter nights. The resulting mixture of smoke and fog was the classic "pea-souper" smog which gave London its reputation of being foggy. The Clean Air Acts of the 1950s eliminated the domestic coal fires which gave rise to the smogs. Nowadays, most people heat their homes with gas and the only fog you're likely to see in London is of the occasional overnight variety. If you're really lucky you might get the odd one in winter under a persistent high-pressure system, but it won't be a pea-souper.

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15y ago
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11y ago

It gets foggy when there is much moisture in the air. Smoke can give the appearance of fog. The famous London fogs were produced by a combination of industrial pollution and moisture .

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13y ago

because they are so far up, they are just clouds.

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Q: Why is it foggy in London?
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