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We have an inversion layer here in Missoula Montana as well. Growing up we were stage 1 or stage 2 almost every day in the winter. Ironically that came from the oil embargo from the 70's. Limit furnace oil and go figure, people just put in a woodstove and go get the massive amounts of free firewood that surrounds us. Then they switched to inexpensive electric baseboard heating in most houses in the 80's as they outlawed wood stoves. Now of course electricity is not inexpensive (it used to easily beat natural gas at a cost per BTU of heat produced). New construction for the last 20 years almost always uses natural gas heating. Now nobody cuts the dead standing firewood and sooner or later it all burns in the summer instead, again causing stage 1 and 2 air alerts.
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