The air we have been "enjoying" in Salt Lake Valley for most of the winter is the equivalent of being a 2-pack a day smoker. So if you are exerting yourself in said air, you are most assuredly doing additional damage to your health. If you want a real scare, do some reading at
http://www.uphe.org/.
The problem is, air quality inside isn't necessarily any better. Maybe I'll join you in Monticello.