Yep, airport for sure. I used to get sick everytime I flew. Not anymore and in hindsight it seems stupid that I never masked at the airport before. And doctor's office if it's my primary care or urgent care. Not much of a need for a mask at the dermatologist. Basically if I'm somewhere there's a fuck load of contagious people.

Recently though, the air quality has been so bad from the wild fires up north that I've worn a mask while out. I came home one day from coughing like crazy and my throat was sore. I thought I was getting sick until I put two and two together about the thick haze of wildfire smog. Masked up until the AQI went back down and saved myself some discomfort.