The main routes of transmission of neocoronavirus infection are respiratory droplet transmission, close contact transmission, and recently aerosol transmission has also been mentioned. Aerosol transmission is defined as the possibility of aerosol presence in a confined, relatively small space environment and the possibility of transmission. Confined small environment, space refers mainly to medical operations, such as tracheal intubation of patients, to patients in close proximity to retain respiratory specimens, there may be the presence of aerogel, which may form a risk of infection to health care workers. So in this environment, medical situation, health care workers are required to do a good job of adequate protection, aerosol transmission in a relatively open environment, the possibility is relatively small, so we do not have to worry too much about aerosol transmission in the outdoor, road air ventilation is very good. Content source: Dr. You Lai