I haven't run since the 19th of August because the quality of our air has been so poor. Like much of the Mountain West, we're under a plume of smoke from California fires. The Cameron Peak Fire, 50 miles upstream, continues to grow. And on the 21st a new fire started about 5 miles from my house and has grown to 165 acres. Yesterday afternoon the CSU air quality station measured a maximum air quality index (AQI) for fine particles smaller than 2.5 micrometers (PM2.5) of 199. That's bad. Three hours outside installing a new chicken coop yesterday has given me itchy eyes, stuffiness, and a cough. I wore a mask, but still inhaled too many particles.
Trail Runner has an article that looks at issue around running and PM2.5 exposure. It has me thinking that I should stay in today even though the PM2.5 AQI is 72, only moderately bad. But this may be the best we get for a few days; I see forecasts of PM2.5 AQI 140 for Tuesday and Wednesday.