Hazy weather is a state of atmospheric pollution that appears more and more often and over a larger area as pollution from urban industrialization becomes more and more serious. There are various sources of haze, such as automobile exhaust, industrial emissions, construction dust, waste incineration, and even volcanic eruptions, etc. Hazy weather is usually formed by a mixture of multiple pollution sources. Sulfur dioxide, nitrogen oxides and respirable particulate matter are the three main components of the haze, the first two are gaseous pollutants, the last one particulate matter is the culprit to aggravate the hazy weather pollution. In recent years, with the gradual deterioration of air quality, the phenomenon of hazy weather has become more frequent, and they invade the human respiratory tract and lungs when people are unprepared, thus causing respiratory diseases, cardiovascular system diseases, blood system, reproductive system and other diseases, such as pharyngitis, emphysema, asthma, rhinitis, bronchitis and other inflammatory diseases, long-term exposure to this environment may also induce lung disease, heart ischemia and injury. Myocardial ischemia and injury. Healthy people who are exposed to haze for a long time will be seriously affected, so for those who are already suffering from lung cancer, it is even more important to strengthen protection when haze occurs. Lung cancer is the most common primary malignant tumor of the lung. Most of the lung cancers originate from the bronchial mucosa epithelium, so it is also called bronchial lung cancer. In recent years, with the influence of smoking and various environmental factors, the incidence rate and death rate of lung cancer have been rising rapidly all over the world, especially in industrially developed countries. Especially the influence of industrial waste gas and dust will seriously induce the occurrence of lung cancer. For people with weak constitution, it is best to prevent lung cancer with the help of traditional Chinese medicine in addition to staying away from the harsh environment. What protection should lung cancer patients do in haze days? There are several ways to protect healthy people and patients from haze, the most important of which is to reduce going out as much as possible. 1, close the doors and windows, the house can use air purifiers In hazy weather conditions, the family should close the doors and windows, wait until the haze dispersion of sunrise and then open the windows for ventilation. The filter of the air purifier can effectively adsorb harmful substances and play the role of purifying air. 2, reduce outdoor activities, go out less hazy days, the public should go out as little as possible, cancel the morning exercise, it is best to wear a medical mask protection when you have to go out, to avoid respiratory tract stimulation leading to disease; return from going out, should immediately wash the face and bare skin. 3, wear a mask When you have to go out on a hazy day, you must wear a mask, the protection of ordinary masks is relatively poor, it is best to choose a professional mask with good protection, such as those that can protect against PM2.5. 4.Eat more vegetables, fish and drink more water in your diet, and try not to stay up late.