Even before Boise started growing there would be "burn bans" in the winter (wood burning stoves) because
any city built at the base of mountains especially with a river is going to have these problems during cold months. In the winter the air gets trapped against the mountains and becomes stagnant(usually a few times each winter). Even rural areas next to mountains have this problem. For the most part the winter inversions start out as fog since there is a river through the city and then it turns dirty after a few days. But then it blows out. Boise usually gets inversions just a few times each winter.
Trust me a Boise inversion is not as bad as a Salt Lake or Denver inversion.
And Boise rarely gets Summer inversions, but the other cities mentioned do
People tend to think that everything is perfect in Boise and when issues arrise the problem is completely blown out of proportion.
As far as the fires in the forests this last month that created the smoke in the valley---give me a break--like this is the cities problem. You cannot control nature and if a forest burns it burns and the smoke gets trapped in the valleys. If anything it should be a reminder of how wild of a place Boise is and the wild land it is situated in and near---we have immense forests just over the mountains.
THe exact same problem happens in other western cities when they have forest or wildfires nearby.
If I remember correctly, last summer we did not have smoke from a forest fire at all during the whole season, so what happened last month is not something that happens every summer.
The statement in the previous post about Boise having the worst air quality in the nation is not true at all.

Boise did have very bad air during the forest fire inversion last month but that is far from normal. This was an extreme year for forest fires in Idaho and it was unfortunate that Boise got the smoke from a lot of fires. Granted the air is not as clean as a small town of 5000 would be, but for a metro this size we are doing great. There are no oil refineries in the area, and Boise does not have the large industrial areas that other cities have which cause pollution. Because of that fact Boise (the city) is rather pristine.
And anyone who is thinking of moving to Boise for our idyllic nature setting will be impressed. We have nature at our doorstep and she is beautiful. Some areas around Boise(to the south and north) are known as having some of the best areas to stargaze because of being situated in the cleanest air in the nation.
You may think I am trying to make things sound better than they are, which I am not, I am telling it the way it is. Some people who represent Boise tend to be very negative and make issues sound a lot worse than they already are because they do not want more people moving here.
I read letters to the editor everyday in the Boise newspaper and there is always a letter about somebody who cannot stand the growth and does not want anybody moving here and they complain about this and that trying to make Boise sound like a bad place and to try and deter people who may want to live here.
The local governments from the cities in the metro area are actually working on a master transit plan which will include light rail someday and a better bus system. Ada county already requires emission testing and Canyon county is supposed to start as well. The mayor of Boise is big on better public transportation and is working on a trolley system for downtown which should all help with auto pollution.
BTW, I did hear on the news tonight that light smoke is in the valley for the next few days until a cold front moves in. There are still some fires burning in Oregon and north of Boise.