【摘要】 目的 调查南宁市大气PM_2.5中金属及类金属污染水平，了解大气污染对人群健康的影响及造成的风险，为采取有效干预措施和减轻大气污染导致的健康危害提供科学依据。方法 2023年选择南宁市2个城区进行监测，每月10—17日在2个城区监测点连续采集空气样品20小时以上，PM_2.5质量浓度运用称量法测定，采用电感耦合等离子体质谱仪测定其中金属及类金属水平，按照《化学物质环境健康风险评估技术指南》（WS/T 777—2021）推荐的模型进行风险评估。结果 2023年PM_2.5浓度范围为0.006～0.050 mg/m³，平均浓度为0.020 mg/m³，季节分布变化有统计学意义（H=25.595,P<0.001）。金属及类金属年平均浓度前5位为Al、Pb、Mn、As、Se，多数金属及类金属浓度冬春季高于夏秋季。As、Cd、Cr（VI）的CR值分别为1.5×10^-5、1.5×10^-6、6.0×10^-6，具有一定致癌风险，宜引起关注。对于非致癌风险，除Pb、Tl未评价外，其余金属及类金属的风险均处于较低水平。结论 2023年南宁市PM_2.5浓度未超过标准规定的二级浓度限值，As、Cd、Cr（VI）具有一定致癌性风险，Be、Pb、Ni致癌性风险较低。金属及类金属的慢性非致癌性风险较低。更多还原

【Abstract】 Objective To investigate the pollution levels of metals and metalloids in the atmospheric PM_2.5 of Nanning, and to understand health impacts and risks of atmospheric pollution on population, so as to provide a scientific basis for effective intervention strategies to reduce health hazards caused by atmospheric pollution. Methods In 2023, two urban districts in Nanning were selected for monitoring. Air samples were continuously collected for over 20 hours at the two urban districts from the 10^th to the 17^th of each month. PM_2.5 mass concentration was determined by the weighing method, and metal and metalloid levels were measured by using inductively coupled plasma mass spectrometry. Risk assessment was conducted according to the model recommended in the Technical Guidelines for Environmental Health Risk Assessment of Chemical Substances（WS/T 777—2021）. Results PM_2.5 concentration ranged from 0.006 to 0.050 mg/m³ in 2023, with an average concentration of 0.020 mg/m³, showing significant seasonal variation（H=25.595, P<0.001）. The top five metals and metalloids by average annual concentration were Al, Pb, Mn, As, and Se, with most exhibiting higher concentrations in winter and spring than in summer and autumn. The CR values for As, Cd, and Cr（Ⅵ） were 1.5×10^-5, 1.5×10^-6, and 6.0×10^-6, respectively, indicating potential carcinogenic concerns. For non-carcinogenic risks, all evaluated metals and metalloids（except for Pb and Tl which were not evaluated） posed low risks. Conclusions PM_2.5 concentration in Nanning dose not exceed the national secondary standard limit in 2023. As, Cd, and Cr（Ⅵ） pose certain carcinogenic risks, while Be, Pb, and Ni exhibit lower carcinogenic potential. Chronic non-carcinogenic risks from metals and metalloids are generally low.更多还原