UV radiation is the disinfectant. Also the vast amount of air makes a dillution of germs and aerosols more likely which is great. With regards to sunlight expo

UV radiation is the disinfectant. Also the vast amount of air makes a dillution of germs and aerosols more likely which is great. With regards to sunlight exposure, sunbathing in the alps was a go-to tuberculosis treatment prior to having antibiotics.