This is a reference to a famous line in a song by Bob Dylan: "The answer, my friend, is blowing in the wind". In this case, there is a literal assocation too, since air pollution literally blows in the wind. The meaning of the lyric is somewhat obscure (to me, anyway), but perhaps the author here doesn't mind too much what it means, just that he or she can make a play on these well-known words.
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