石家庄市冬季典型重污染过程分析

为研究石家庄市冬季重污染天气过程的成因及影响因素,对2015-01-07至2015-01-10这一时间段的重污染过程从PM2.5浓度变化、气象条件演变及其对PM2.5浓度的影响、PM2.5与主要气态污染物的相关性、区域性污染传输等方面进行分析。结果表明:此次石家庄市重污染过程是在区域性大气静稳态背景下形成的,地面压力及风场对PM2.5浓度影响较大;石家庄NO2浓度与PM2.5浓度相关性很高,机动车尾气对城市的污染逐渐加剧;SO2浓度与PM2.5浓度相关性高说明燃煤仍是石家庄市重要污染来源;该时间段河北南部城市区间存在污染物区域性传输。

Analysis of typical heavy pollution episode in winter in Shijiazhuang City

To investigate the formation and the key affecting elements of the heavy pollution episode in Shijiazhuang City, typical heavy pollution episode during January 7th-10th, 2015 is analyzed in the aspects of the variation of PM2.5 concentration, the evolution of metrological conditions and its effects on PM2.5 concentration, the correlation between PM2.5 and major gaseous pollutants, and transboundary transport of pollutants. The result shows that the heavy pollution episode is formed under stable metrological conditions of North China, and surface pressure and wind field have great influence on PM2.5concentration. The high correlation between concentrations of NO₂ and PM2.5 shows the aggravation of traffic-related air pollution. The high correlation between concentrations of SO₂ and PM2.5 indicates that coal combustion is still the important pollution source in Shijiazhuang City. During the episode, the pollutants transported from city to city in South Hebei Province.