乌鲁木齐市PM2.5中碳组分污染特征及来源解析OA北大核心CSTPCD

To investigate the concentration of PM2.5,pollution characteristics,and sources of carbon components in the urban area of Urumqi from July 3,2023,to December 31,2023,air samples were collected and monitoring and analysis were performed in accordance with experimental procedures.The average concentration of PM2.5 in Urumqi is 20.1±8.1µg·m-3,with average concentrations of OC and EC of 3.2±1.0 and 0.6±0.2µg·m-3,respec-tively,and a trend for higher concentrations during the heating season than the nonheating season.Good correla-tions between OC and EC were observed in various time periods,suggesting a similar source for OC and EC.The estimated average total carbon aerosol concentration is 7.52±3.66µg·m-3,accounting for approximately 16%of the PM2.5 concentration,and the concentration of secondary organic carbon(SOC)is 2.11±1.43µg·m-3,with an SOC/OC ratio of 47.47%±12.69%,indicating that secondary organic carbon(SOC)accounts for nearly 50%of the OC in Urumqi's atmosphere.Principal component analysis revealed that the main sources of carbon compo-nents in PM2.5 are coal combustion emissions and vehicular exhaust.Overall,severe atmospheric pollution per-sists during the heating season.