I think there are masks you can use outside too. You can also check which times of day/days are worst. And which streets. You can carry the laseregg around for local measures.
https://smartairfilters.com/en/blog/how-accurate-are-common-...
So may be better solution are local laboratories with calibrated equipment
Masks are tricky.
Most "light" masks are for huge particles and can't defend against most of dangerous chemicals
Military and science masks are working good against some chemicals and do not protect from another. Except solutions with O2 tanks on your back
Not sure how it compares with Awair or laseregg.
I have no affiliation with PurpleAir, but they are pretty popular in Utah.