Excessive mass sterilization can be harmful to the human body. Large-scale disinfection can easily lead to dizziness, headache, nausea and other discomforts among those who have been exposed to the disinfectant in excess. The high concentration of disinfectant in the air also tends to irritate the airways, leading to coughing and breathing difficulties among people within the extermination area, and in serious cases, chemical bronchitis, chemical pneumonia and even pulmonary edema may occur. For people suffering from respiratory diseases can easily cause irritation, inducing or aggravating respiratory diseases. If you are allergic, it is easy to induce allergies. All kinds of disinfectants contain a large number of chemicals, especially chlorine disinfectant, in the sterilization at the same time will remain in the air, not easy to evaporate. Excessive large-scale disinfection residual disinfectant will cause air pollution and groundwater pollution. Therefore, according to the needs of epidemic prevention and control, disinfection activities should be carried out reasonably, avoiding excessive large-scale disinfection. Before disinfection, personnel should be well protected by wearing gloves and masks, waterproof aprons, rubber boots and other protective equipment. It is also important to put food and vegetables in a safe place away from disinfectants before disinfection. Keep doors and windows closed during the disinfection process and do not go into the disinfected environment during this time. The disinfectant solution should be properly proportioned according to the instructions so as not to affect the disinfecting effect.