Currently, there is no evidence that aerosol transmission is more dangerous than droplet transmission. The routes of transmission such as aerosol and digestive tract of novel coronaviruses are not yet clear, and droplet transmission and contact transmission are still the main channels of transmission. Most aerosol transmission occurs in closed rooms, such as laboratories and operating rooms, and once released into the atmosphere, aerosols will have a lower transmission capacity. Therefore, the general public is advised to open windows frequently for ventilation. In addition, in public confined places, such as elevator rooms, it is important to pay attention to personal protection and not to take off the mask even if there are no other people accompanying you.