Human life activities can not be separated from air for a moment. Breathing exercises inhale necessary oxygen from the air and exhale waste gas carbon dioxide to maintain the normal metabolism of the human body. Usually, an adult breathes more than 20,000 times a day and inhales about 1 10,000 liters of air. In general, air is relatively stable because it is always flowing. It contains 78.09% nitrogen, 20.95% oxygen and 0.93% fluorine. Carbon dioxide 0.02%. Nowadays, with the rapid development of industry and transportation, there are many high-rise buildings and dense population in the city. The exhaust gas from industrial production and motor vehicles, as well as the exhaust gas from indoor gas fuels and households in high-rise buildings, are often concentrated and difficult to dissipate in a short time, thus forming primary pollutants such as sulfur dioxide, carbon dioxide, nitrogen dioxide, floating dust, hydrocarbons and oil mist, as well as ozone, acetaldehyde, sulfur trioxide and photochemistry generated by these primary pollutants due to light and chemical action. These pollution sources can cause acute and chronic diseases and carcinogenesis of respiratory tract, circulatory system and nervous system respectively. In particular, recent global environmental events, the greenhouse effect of carbon dioxide, the cooling effect of dust and the destruction of the ozone layer are all related to air pollution. This big problem, which affects the ecological balance of the universe and human survival, has attracted the attention of people all over the world. The measures to prevent and control air pollution are as follows: ① The industrial layout should be balanced and reasonable, so as to achieve dispersion and concentration, urban and rural integration, and integration of workers and peasants, which is not only conducive to production, but also convenient for life. (2) Planting trees in Shan Ye and courtyard greening will make plants play their role in filtering poisons and purifying the air. (3) Change fuel composition and combustion mode to save fuel and reduce exhaust emissions. Take regional heating and dust removal measures to reduce the emission of dust and soot in the air. (4) Comprehensive utilization of waste gas and dust, with the most active protective measures, turning waste into treasure and turning harm into benefit.