Well, if they salt the roads up there like they do down here when they ice (which is about once a decade), and there is a winter storm blowing the road mist around, then you'll have salt air
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Not sure how this relates to the discussion, but this salt in the air thing is really true up here in Maine, however it only lasts for a month or so. They put an incredible amount of salt on the roads here. In MY small town of just a couple hundred people, it's put down as a mixture of salt and sand, and we put down TONS of salt every winter. Some places, like Ice said, it can be a liquified version, but that doesn't matter, because it eventually dries up, and gets up in the air.
In the late spring/early summer, all this salt on the road dries up, and when the cars drive over it, it's up in the air as a very fine particulate, and you can taste it, and feel it on your skin and in your eyes. My wife has a sensitivity to the salt, and one year, after a week with several highway trips, ended up with severe swelling of her face.
Usually, after a few good rain storms, the salt gets washed away, but it takes more than one storm to get rid of it. I'm part of the local town gov here, and have been trying to get them to cut back on the amount of salt put down, but I've been outvoted.