Did snow control the epidemic?

The inhibitory effect is very limited.

COVID-19 is mainly transmitted by human contact, and the contact between people is transmitted by droplets, not by air, because the virus will die soon after entering the air and cannot survive without human body. There is no human body, and it does not have the function of replication and infection, so snow has little effect on it.

The real source of infection is people, not air. Air is a medium, but it takes people to emit this virus to reach another person's body. It doesn't mean that people pass through this place and it has a virus, and then others will pass through this place. This virus is not contagious. It will have no room to live in the outside air and will die soon, so the possibility of its transmission through the air is very low, and it is high or low through droplets.