Analyses of Air Pollution Characteristics and Potential Sources in Shahe City, Xingtai during the Winter

To study the air pollution characteristics in Shahe, Xingtai, Hebei Province in the winter, the air monitoring data collected at three monitoring sites from December 2017 to February 2018 are analyzed. Spatial and temporal characteristics and potential sources of major pollutants in Shahe are analyzed. The study reveals that the average mass concentrations of PM2.5 in the sites of Sifaju, Shizhengfu, and Xuanchuanzhongxin stations are 118.0, 121, and 135 μg/m³, respectively. Under the joint effects of natural and anthropogenic emissions, the major pollutants display an obvious diurnal variation. Over the whole campaign period, mean values of ρ(PM2.5)/ρ(PM10) and ρ(SO₂)/ρ(NO₂) are 0.57 and 1.05 (ρ ispollutant concentration), respectively. With the aggravation of air pollution, both ρ(PM2.5)/ρ(PM10) and ρ(SO₂)/ρ(NO₂) raise sharply, which demonstrate the increase in coal combustion. Analyses of spatial characteristics of pollutants illustrate that pollutants produced by glass enterprises located to the northeast of the three sites may have an impact on the monitoring sites. Analyses of spatial variation of air pollution reveal that the more severe the pollution, the smaller the spatial difference. For Shahe, local and surrounding cities are strong potential sources of PM2.5.With increases in PM2.5 concentration, the areas of strong PM2.5 source shrink. It is also found that local emission sources in southeastern Shahe, where most of glass factories are located, make a major contribution to high PM2.5 concentration in Shahe.