I said that wearing a mask outdoors in isolated areas reducing the spread of covid isn't supported by scientific evidence.
That's not what you said. I double checked. But now that you've added 'in isolated areas' I agree with you. Wearing a mask
outdoors though? There
is evidence to back doing that (in non-isolated) areas.
Science has shown us that mask wearing works to filter particles from the air - this increases safety from airborne diseases like covid (
https://www.nature.com/articles/s41591-020-0843-2#Sec3][url]https://www.nature.com/articles/s41591-020-0843-2#Sec3[/url]) because when people breathe, the virus is aerosolized (
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6382806/) in tiny droplets that escape into the air. Wearing the mask indoors or out is irrelevant to those facts. Mask wearing reduces the probability of catching covid. Even if the odds of catching covid outdoors are super small (say 1/1,000,000,000) science tells us that the odds of catching covid outdoors with a mask on are still less than that.
Science also tells us that spread of the disease outdoors is very low.
https://onlinelibrary.wiley.com/doi/full/10.1111/ina.12766among our 7324 identified cases in China with sufficient descriptions, only one outdoor outbreak involving two cases occurred in a village in Shangqiu, Henan. A 27‐year‐old man had a conversation outdoors with an individual who had returned from Wuhan on January 25 and had symptom onset on February 1. This outbreak involved only two cases.
The only recorded case there was transmission from two people who were in close proximity, so we know that the likelihood of a problem at a distance is extremely small - but science tells us that it's possible.
Most sane people would play the odds and forego wearing a mask outdoors. I certainly do, as do the majority of other people I see. The main exception seems to be when a person is going to be close to others (say, at a baseball game outdoors), waiting to get on a bus, going to go into a building soon, or walking down a very busy sidewalk. If I drive to the grocery store, I usually put my mask on in the car - that's a convenience thing rather than a fear of covid thing. It's harder to mask up while walking.
TLRD - Science actually does support the use of masks outdoors. Not the use of masks outdoors in isolated areas though. At least none that I could find.