Pollution characteristics and health risk assessment of heavy metals inatmospheric environment PM2.5 in a district of Nanjing

Abstract

Abstract: Objective To understand the pollution trends of fine particulate matter（PM_2.5） and its heavy metal components in the atmosphere of a district in Nanjing from 2017 to 2022,and to evaluate their risks to population health. Methods The PM_2.5 samples were collected from 10th to 16th of each month from 2017 to 2022. The mass concentration and heavy metals content of PM_2.5 were determined by weighing method and inductively coupled plasma mass spectrometry,and the respiratory exposure risk of heavy metals components were assessed by health risk assessment model. Results The concentrations range of PM_2.5 in a certain district of Nanjing from 2017 to 2022 was 10-211 μg/m³,with a median of 46.50 μg/m³. PM_2.5 exceeded the 24-hour average concentration limit for 102 out of 504 days. Except for Cr,there were statistically significant differences in the concentration of pollutants in different seasons（all P<0.01）. The non-carcinogenic risk index（HQ） of Mn and As was greater than 1,indicating chronic non carcinogenic risk. For carcinogenic risk,the carcinogenic risk of Cr and As were both higher than the acceptable level of 1.0×10^-6. Among them,Cr had a 3.97% carcinogenic risk exceeding 1.0×10^-4,while Cd,Ni,and Pb had 65.08%,12.30%,and 4.56% carcinogenic risks exceeding 1.0×10^-6,respectively. Conclusion From 2017 to 2022,Mn and As in PM_2.5 in a certain district of Nanjing City have non-carcinogenic risks,while Cr and As have higher carcinogenic risks. Cd,Ni,and Pb may cause malignant tumors,and pollution control and population protection should continue to be carried out.

Key words: Fine particulate matter, Heavy metals, Pollution characteristics, Health risk assessment

WEI Li, ZHANG Yi, SUN Fengxia, GONG Xing, XU Changdi, XIONG Lilin. Pollution characteristics and health risk assessment of heavy metals inatmospheric environment PM_2.5 in a district of Nanjing. [J]OCCUPATION AND HEALTH, 2025, 41(4): 515-520.

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Pollution characteristics and health risk assessment of heavy metals inatmospheric environment PM_2.5 in a district of Nanjing

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