北京市O_3污染的区域特征分析

Provincial Characteristics of Ozone Pollution in Beijing

通过优化布点试验 ,对北京市O3 及其主要前体物NO2 、NOx进行了强化监测 ,描述了北京目前O3 污染的区域特征。通过数据分析 ,初步探讨了北京市大气对流层O3

Ozone is an important minor constituent of the natural atmosphere, whose average content is 10 -2 10 -1 μg/cm 3. It mostly gathers in 10-30?km stratosphere, only about 10% is distributed in troposphere. Ozone plays an important role in atmosphere chemistry, and it can protect human and environment in stratosphere. But if ozone content is too high in troposphere, the health of human will be harmed. Ozone in troposphere results from photochemical reaction of NO x or/and hydrocarbon released by natural and artificial sources. Recently, with the increase of autombiles in possession and the use of fuel, oil products and organic dope, the concentration of NO x and VOC rise in atmosphere. Ozone pollution in troposphere is more and more serious. In this article, a network of sampling stations is designed and optimized, ozone and its precursors NO 2, NO x are monitored in Beijing, and the current important characteristics of ozone pollution are analyzed and described. Through analyzing and processing data, ozone formative mechanism in troposphere and correlativity between main precursors concentration and ozone in troposphere are discussed.