It is not necessary for the general population to spray alcohol in the air before having a nucleic acid test because the site of the nucleic acid test is sterilized by special disinfecting staff at regular intervals. If anyone is found coughing, sneezing or even vomiting loudly at the site, there will also be staff to sterilize the air. Usually, the nucleic acid testing site will be located in an open area with good air circulation, so that the virus can stay for a very short time. Secondly, no matter whether the nucleic acid testing site is located outdoors or indoors, special disinfecting staff will be arranged to disinfect the floor and the air at regular intervals. Furthermore, if someone coughs loudly, sneezes or even vomits at the nucleic acid testing site, staff will also come immediately to disinfect the area. Therefore, there is practically no need for the general public to sterilize the air anymore. When doing nucleic acid, do not take off the mask too early, wait until the medical staff is ready before taking off the mask, and put it on immediately after taking the sample, so as to reduce the risk of cross-infection. Therefore, the general population does not need to sterilize the air before doing nucleic acids, and should pay attention to good personal protection, such as wearing masks correctly and maintaining social distance.