文档介绍：Air pollution state of china
1 Urban air quality situation of china
In recent years, our urban air quality is stability, the trendy is improving. There are 660 cities officially designated in the monitoring of 343 cities, the air quality of secondary and tertiary levels and the urban poor around one third of each volume. Ultra-slight decline in the proportion of urban standards, particles from pollution broader, serious pollution in some cities sulphur dioxide, nitrogen dioxide are all urban pollution. The areas affected by acid rain and pollution stability, the South acid rain polluted areas, the acid rain control zone of the city has more than 90% acid rain
113 air pollution control in key cities, the air quality of Grade 2, Grade 3 and the number of urban poor levels respectively 40, 41 and 32, respectively %, % and %. Of these, 36 cities where sulphur dioxide and particulate emissions standard urban 73. Our air quality urban environment with the following features :
First, the particles are still the primary pollutants. Particle emissions are the main pollutants affecting air quality in 343 monitored cities, 60% of particles from urban concentration limit, % of the city where major cities. Particle pollution from the northern city overall in the South-cities, particles from polluted cities mainly in the northwest, north China, Shanxi, Shaanxi, Henan, Heb