The harm of air pollution to human body can be divided into the following three categories:

1. Acute hazard: the concentration of pollutants is very high in a short period of time, or the combination of several pollutants can cause acute harm to human body.

2. Chronic hazards: chronic hazards mainly refer to the hazards caused by the continuous action of small doses of pollutants on human body. Such as air pollution on the respiratory tract chronic inflammation incidence rate and so on.

3. Long term harm: the harm of environmental pollution to human body is generally shown after a long incubation period, such as carcinogenic effect of environmental factors. Environmental carcinogenic factors mainly include physical, chemical and biological factors. Physical factors, such as leukemia and lung cancer caused by external radiation or inhalation of radioactive substances, and biological factors, such as tropical malignant lymphoma, have been proved to be caused by a virus transmitted by blood sucking insects. Chemical factors, according to animal experiments, there are more than 1100 kinds of carcinogenic chemicals. In addition, pollutants have a great influence on genetics. All organisms have the characteristics of genetic variation. The harm of environmental pollution to human genetics is mainly manifested in mutagenicity and teratogenesis.