Upper respiratory tract infection Continuous haze weather envelops more than 10 provinces across the country, haze weather, air floating a large number of dust particles and smoke particles and other harmful substances, will cause harm to the human respiratory tract, air floating a large number of particles, dust, pollutants viruses, etc., once inhaled by the human body, will stimulate and damage the respiratory mucosa, so that the nasal cavity becomes dry, destroy the respiratory mucosa defense, bacteria into the respiratory tract, It is easy to cause upper respiratory tract infections. Bronchial asthma In hazy weather, the air pollution is heavier than usual and the air is often filled with bacteria and viruses, which can easily lead to the spread of infectious diseases and the occurrence of many diseases. In particular, air pollutants in the city are not easily diffused, increasing the toxicity of sulfur dioxide, carbon monoxide, nitrogen oxides and other substances, which will seriously threaten human life and health. During hazy weather, dust and soot float in the air, and dust mites may also be suspended in the mist. When bronchial asthma patients inhale these allergens, they will stimulate their respiratory tracts and experience asthma symptoms such as coughing, stuffiness and breathlessness. Lung cancer Professor Kan Haidong of the School of Public Health of Fudan University said that the latency period of lung cancer ranges from several years to decades, and that lung cancer in children at a young age is likely to be related to genetic factors and genetic mutations. However, compared with adults, children’s height determines that they are indeed more affected by car exhaust and road dust, which is a consensus in the medical community. Because children’s respiratory zone is just near the height of exhaust fumes, and because children have higher respiratory exposure per unit body weight than adults, resulting in higher susceptibility, they are more affected by polluting gases such as exhaust fumes and haze. Coupled with the fact that children’s body organs are not fully developed, the damage caused by pollutant gas infestation is also greater.