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Well, "inversions" aren't necessarily bad, it just depends. Kalispell does get inversions periodically, but the locals love them because you can go ski on Big Mountain and look at the clouds below while skiing in the sun. It's the most beautiful thing you've ever seen, it just looks like your skiing in heaven.
As far as air quality, valley's in general are more of a problem for bad air than open land (like Bozeman). The Flathead does experience times when the air goes stagnet and the pollution will go up because no fresh air is entering the valley. Stagnet air or invesions really aren't the problem there, it's the forest fires in the summer. When the inversions in the summer trap in the smoke from the forest fire, then the pollution goes way up.
In general, people with asthma do pretty good in the Flathead and I didn't hear people complain about it. Dust in the summer from the roads can be another concern - you may wish to live off of a paved road rather than gravel road to limit dust exposure. They will oil some of them in the summer but it only helps for a little while.
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