It's about the transmission. Since there is a lot of proof the current virus is airborne it helps to be in the open air or at least have a good ventilation sys

It's about the transmission. Since there is a lot of proof the current virus is airborne it helps to be in the open air or at least have a good ventilation system. Schools could beat the spreading of the virus with well ventilated classrooms. And for that matter: the US could beat the virus with good ventilated rooms. Note that dry air from airconditioners helps airosols to keep floating. Without fress air: wear a mask!