Guangzhou is located in the southern subtropics, is a typical monsoon climate in the southern subtropics. Not yet in April, the temperature gradually climbed, the street wearing short sleeves, short skirts and other cool dress up, many hotels, hotels, shopping malls, offices and even ordinary people’s homes, are eager to turn on the air conditioning. It brings people joy and coolness, but also brings people troubled air-conditioning-related diseases. There are two main types of air-conditioning-related diseases: First, infectious diseases caused by air-conditioning. Because the air ducts of air conditioners are difficult to clean, resulting in a lot of dust inside, which provides nutrients for germs, and at the same time, with the right temperature and humidity, influenza germs are able to survive, reproduce and spread here. When the air conditioner is turned on, a large number of hidden germs will spread in the air with the cold air, permeating the room and easily causing infections. Among the common ones are: 1, Legionella, is hidden in the air conditioning refrigeration unit in the pathogenic bacteria, it will be blown out with the cold air floating in the air, inhalation of the human body will be upper respiratory tract infections and fever symptoms, the serious cases can lead to respiratory failure and kidney failure. Legionnaires’ disease is caused by Legionella bacteria, which arise in the natural environment and spread in warm water and hot, humid places. Air-conditioning refrigeration systems provide a living environment for the mass reproduction of Legionella bacteria, and people staying in such environments are susceptible to Legionella infections. 2, is due to the relative closure of the air-conditioning environment caused by the flu infection. Summer is the very time when influenza is prevalent, and the characteristics of influenza spreading through the air, it is very easy to spread in the air-conditioned relatively closed environment. Influenza is a disease caused by the influenza virus, which spreads mainly through airborne droplets, and is a highly contagious acute respiratory infectious disease. It is characterized by a short incubation period, rapid transmission and high morbidity. The main symptoms of influenza include sudden onset, high fever, chills, headache, weakness, throat inflammation, muscle aches and dry cough. In a crowded air-conditioned environment, it is extremely easy for influenza to spread from person to person through the action of air-conditioning. Information Times has reported: in mid to late January 2007, the State General Administration of Sport Training Bureau a number of world champions, including more than 40 people fell ill with influenza. After testing was found to be due to the empty ventilation pipe due to a long time without cleaning, covered with germs, influenza germs with the wind, ultimately leading to athletes fall ill one after another. Second, we often say that the air conditioning disease stay in the air-conditioned environment for a long time triggered by the decline in body functions. Long time in the air-conditioned environment, people work and study, because the air does not circulate, the environment can not be improved will appear a series of symptoms of physical decline. The general manifestation of nasal congestion, dry eyes, dry lips, dizziness, tinnitus, fatigue, memory loss, dry skin, allergies and so on. Heavy manifestations of cold discomfort, fatigue, muscle and joint pain in the limbs, headache, lumbago, limb pain and foot numbness. The more serious easily triggered respiratory tract infections and other diseases. In the air-conditioned environment, the elderly, children, women and low resistance, especially long-term stay in the office staff need more protection. In fact, air-conditioning-related diseases can be prevented, the hot summer need to beware of air-conditioning-related diseases: 1, pay attention to air-conditioning hygiene. A long time without cleaning the air conditioning will have a lot of dust, bacteria, viruses, in the use of the body will be easy to inhale, easy to get sick. Prevention of Legionnaires’ disease is mainly about taking management precautions against known possible sources of infection, including regular cleaning and disinfection to minimize the growth and reproduction of Legionella bacteria. Professionals should be called in once a year to fully clean and disinfect air conditioners. Now is a good time to clean and disinfect air conditioners to keep us safe for the hot summer months. And it is best to clean the filter every week during the use of air conditioning. 2, pay attention to personal hygiene. Personal hygiene also plays a key role in preventing infectious diseases and influenza. Viruses are easily infected through hand contact with items with viruses on the surface and then touching the mouth and nose. Therefore, it is very important to wash your hands and keep them hygienic, and you should also try to avoid touching your eyes, mouth and nose with your hands. 3. Pay attention to air circulation. Infectious diseases, influenza virus is a virus transmitted through the air, especially in the closed environment is more likely to spread, so we should often open the windows to ventilate, pay attention to keep the indoor air circulation, so as to reduce the concentration of viruses in the room, reduce the chance of contact between people and viruses. Try to choose open air or places with good air circulation for your usual activities, avoid staying in confined environments, and go to fewer crowded public places. The script of the summer heat is getting closer and closer, and the common summer diseases also come one after another. In this hot summer, we have to protect ourselves from diseases.