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Bergen is known to have smog in the winter. Here is a couple of links about the issue.
[“Bergen is being choked by pollution”](http://www.bt.no/nyheter/lokalt/Bergen-kveles-av-forurensing-1767900.html#.UyGAYPk0Ih8)
[Here you see that it’s a regular occurence](http://www.bt.no/nyheter/lokalt/Na-kommer-giftlokket-3036567.html#.UyGAvfk0Ih8)