Anecdotally this is absolutely true. I know several people who wear masks while sitting in a car for long period of time with someone else. I know others who th

Anecdotally this is absolutely true. I know several people who wear masks while sitting in a car for long period of time with someone else. I know others who think going on jam packed public transport with a mask is basically safe. The least bad are the teachers who think when you spend an hour in a classroom with 30 people a mask will keep you safe. Aerosol transmission. It won't. In an hour the air will fill with the virus if someone is infected. The original virus apparently took 15 minutes to infect in a room. If delta is minimum 6x more infectious we are talking minutes. By increasing air circulation, or meeting outside, we can reduce infections much more than if 30 people are wearing a mask inside a room for an hour.