A foreign tourist and a child wearing protection masks walk through Tiananmen Square in Beijing as the city was blanketed by heavy smog last week.
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When did the smog issue come to the world?

At the beginning of the 20th century, environmentalists and the general public were attracted to it and found that it was a mixture of fog and smoke, which is very different and more diverse than the fog or haze of winter, which is proving to be painful for humans.

London is said to be the first city where people first encountered this type of air pollution and used the word smog.

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