Seoul often has poor air quality; I'm not sure of the figures, but when I visit (I live in a smaller city outside Seoul but connected to it) the air is often grey and dirty-looking. Quite a few people wear masks, especially bicyclists.
Here are two pictures; they aren't very good, as they were taken from inside a subway car as it crossed over the Han River in the middle of Seoul (time = about 12:30 pm):
Here are two pictures; they aren't very good, as they were taken from inside a subway car as it crossed over the Han River in the middle of Seoul (time = about 12:30 pm):
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