Comment by ptero

Indoors. There were decades of research leading to the recommendations of mask wearing when symptomatic and only indoors.

All that fell by the wayside when mask wearing became a covid-time cult. A friend (with a degree in epidemiology) told me that if she tried to argue those points and doubts outdoor mask mandates she will be the immediately out of her job.

The covid-time environment of shutting down scientific discussions because policymakers decided that we had enough science to reach a conclusion should not be forgotten, it was a reasonable concern turned into a cult. My 2c.