Viruses are small, simple, non-cellular organisms that can only live on living cells. Viruses do not have their own metabolic machinery, so the virus leaves the host cell, there is no life activity. The higher the temperature, the harder it is for the virus to survive, but it is winter and the virus will survive longer in the air. Humidity: Viruses generally spread more easily in dry air (in humid air, viruses are more likely to land on surfaces and ground) The current influenza A (H1N1) virus can survive for 2 hours in dry air, which is the longest known survival time of the virus in the air. The survival time of the coronavirus is similar to that of the flu virus, but in humid air, the survival time can even reach 1 day.