The state has an incredibly strict abortion ban.
One of the worst rates of education in the Nation.
A blanket ban on Marijuana
There is no tax on fire arms, and concealed carry is legal.
Some of the worst child healthcare in the nation.
Of course, the state, itself, is pretty conservative. So if you feel you'll be directly affected by things like abortion bans or poor education, then you'll want to be careful where you end up and how you navigate any of that. But if you're making decent money in a city like Boise and enjoy the amenities of the area and can get over the state-level politics (because, again, Boise is quite progressive and you can get weed easily, etc.), then you'd probably experience a nice quality of life.
As you said, Boise is in a sort of bowl (more of a valley), in the winter, a cold air system can get trapped in the valley by warmer air in the mountain area. This can lead to some pretty bad air (not nearly as bad as wildfires, just not very fresh). To me, the bigger complaint is about not seeing the sun for days. Idaho has a lot of sun throughout the winter, so it's noticeable. It isn't all winter, just a week or so at a time a few times per winted, depending on weather.
But otherwise, Boise's air is quite clean.
https://www.eff.org/deeplinks/2025/10/flock-safety-and-texas...
Moving to Idaho, and giving these states a tax base with which to further perpetuate these fascist policies is not a winning solution.
It has a similar median household income to California once you adjust for cost of living: https://www.reddit.com/r/dataisbeautiful/comments/1nemaep/oc....
It has among the lowest income inequality in the country: https://worldpopulationreview.com/state-rankings/income-ineq.... And similar income mobility to the California or New York: http://www.equality-of-opportunity.org/neighborhoods/.
It has a lower poverty rate than California or New York: https://www.census.gov/library/stories/2025/09/spm-below-off....
Better education than California and better on most subtests than New York: https://www.nationsreportcard.gov/profiles/stateprofile?sfj=...
Additionally, Idaho has a lot of beautiful natural scenery.