乌鲁木齐市主城区PM2.5组分特征及来源解析研究OA

To clarify the chemical composition and source characteristics of PM₂.₅ in the main urban area of Urumqi,this study systematically investigates the component characteristics,source structure,and seasonal variations of PM2.5 based on relevant monitoring data in 2025 and the PMF model analysis method.The results show that the chemical composition of PM2.5 in the main urban area of Urumqi is dominated by secondary ions and carbonaceous components,with prominent proportions of secondary components such as sulfate and nitrate,indicating the leading role of secondary pollution.The concentration of PM2.5 presents significant seasonal differences:the concentration in winter(heating period)is remarkably higher than that in summer,which is closely related to industrial processes,coal combustion and poor atmospheric diffusion conditions.From the perspective of sources,industrial process emissions,coal combustion and motor vehicle exhaust are the main contributing factors.Specifically,industrial emissions from steel,smelting and other industries,coal-fired emissions,and motor vehicle exhaust emissions collectively constitute the primary sources of PM2.5,while biomass combustion and dust act as auxiliary contributing factors,further complicating the composition of regional air pollution.This study can provide a scientific basis for the prevention and control of PM2.5 pollution,precursor emission reduction and environmental quality improvement in Urumqi.