Haze includes fog and haze, which is a climatic phenomenon, and the haze is harmful to the human body mainly in the following aspects: 1. The effect on the respiratory tract, a large number of fine particles are continuously floating in the haze, which cannot be completely degraded, and long-term exposure to the haze environment will inevitably lead to inhalation of fine particles, which can be deposited in the respiratory tract and cause damage to the respiratory system, which can induce bronchial asthma and also cause Bronchitis, chronic bronchitis, etc. 2. Induced infectious diseases, bacteria are more likely to multiply in hazy weather, thus increasing the chances of human infection, which can cause both respiratory tract infection and intestinal infection, urinary tract infection, etc. 3. Neurological effects, dizziness and headache are easily caused in the haze environment, and it has been reported in the literature that the tiny particles in the haze can cause cerebral hypofunction.