关键词: PM₁₀, PM_2.5, 燃烧源, 污染水平, 北京市区

Abstract:

In order to have a grasp of the pollution situation of PM_2.5 and PM₁₀  from combustion in Beijing, the distribution regularities and influence factors of PM_2.5 and PM₁₀  were analyzed after sampling PM_2.5 and PM₁₀  at three sites representing combustion sources, i.e. the top of testing building at China University of Geosciences in Beijing (CUGB), the Shougang Coking Plant and the east gate of Shougang, from March 13 through March 25, 2005 A series of results are concluded as follows. Being controlled by pollution sources and weather conditions, the concentrations of PM_2.5 and PM₁₀  vary hourly, and two peaks present at different time in a day; they vary with temperature as well, the maximum concentration has relationship with the low temperature, while the minimum can be detected at the high temperature. The concentrations of PM_2.5 and PM₁₀  from combustion vary with the content of moisture as well, the maximum value is related to the high humidity and the minimum value can be detected in the low moisture.Comparing the concentrations of PM_2.5 and PM₁₀  from combustion in Beijing with those in other 8 cities of China, it is found that the pollution level in Beijing is very serious and the concentrations all exceed the pollution standards of China for PM10 and U.S. EPA for PM_2.5. It is found that the concentration of PM10 is still above the pollution level of China. New measures about combustion emission and environmental protection should be established as soon as possible to improve the air quality in Beijing city.

Key words: PM₁₀, PM_2.5, combustion source, pollution level, Beijing city