I look at the PM2.5 data for my city every day, and at this point (Nov) in the winter season, the only acceptable time to exercise is between 2PM-4PM after vertical mixing kicked in. Outside that duration, particulates are elevated after morning rush our, after evening rush hour, or during overnight inversion trapping evening rush hour + wood burning smoke until the next morning rush hour.

This is one the main reasons why I would prefer working remote, it is hard to utilize this time well (for exercise) if you are in the office.

At least with PM you can wear a mask, although I am still searching for the best one that works during intense exercise.

Also wanted to point out "Trump EPA moves to abandon rule that sets tough standards for deadly soot pollution"

https://apnews.com/article/epa-soot-air-pollution-trump-zeld...