Molecular-Level Insights into the Relationship between Volatility of Organic Aerosol Constituents and PM2.5 Air Pollution Levels: A Study with Ultrahigh-Resolution Mass Spectrometry,Environmental Science & Technology

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Molecular-Level Insights into the Relationship between Volatility of Organic Aerosol Constituents and PM2.5 Air Pollution Levels: A Study with Ultrahigh-Resolution Mass Spectrometry
Environmental Science & Technology ( IF 11.4 ) Pub Date : 2024-04-27 , DOI: 10.1021/acs.est.3c10662
Kai Wang ₁ , Yun Zhang _{2,

3} , Haijie Tong _{4,

5} , Jiajun Han ₂ , Pingqing Fu ₆ , Ru-Jin Huang ₇ , Hongyan Zhang ₂ , Thorsten Hoffmann ₃

Affiliation

State Key Laboratory of Nutrient Use and Management, College of Resources and Environmental Sciences, National Academy of Agriculture Green Development, Key Laboratory of Plant-Soil Interactions of Ministry of Education, National Observation and Research Station of Agriculture Green Development (Quzhou, Hebei), China Agricultural University, Beijing 100193, China
Innovation Center of Pesticide Research, Beijing Advanced Innovation Center for Food Nutrition and Human Health, Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100193, China
Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg University, Mainz 55128, Germany
Institute of Surface Science, Helmholtz-Zentrum Hereon, Geesthacht 21502, Germany
Multiphase Chemistry Department, Max Plank Institute for Chemistry, Mainz 55128, Germany
Institute for Surface-Earth System Science, Tianjin University, Tianjin 300072, China
State Key Laboratory of Loess and Quaternary Geology, Center for Excellence in Quaternary Science and Global Change, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, China

Volatility of organic aerosols (OAs) significantly influences new particle formation and the occurrence of particulate air pollution. However, the relationship between the volatility of OA and the level of particulate air pollution (i.e., particulate matter concentration) is not well understood. In this study, we compared the chemical composition (identified by an ultrahigh-resolution Orbitrap mass spectrometer) and volatility (estimated based on a predeveloped parametrization method) of OAs in urban PM_2.5 (particulate matter with aerodynamic diameter ≤ 2.5 μm) samples from seven German and Chinese cities, where the PM_2.5 concentration ranged from a light (14 μg m^–3) to heavy (319 μg m^–3) pollution level. A large fraction (71–98%) of compounds in PM_2.5 samples were attributable to intermediate-volatility organic compounds (IVOCs) and semivolatile organic compounds (SVOCs). The fraction of low-volatility organic compounds (LVOCs) and extremely low-volatility organic compounds (ELVOCs) decreased from clean (28%) to heavily polluted urban regions (2%), while that of IVOCs increased from 34 to 62%. We found that the average peak area-weighted volatility of organic compounds in different cities showed a logarithmic correlation with the average PM_2.5 concentration, indicating that the volatility of urban OAs increases with the increase of air pollution level. Our results provide new insights into the relationship between OA volatility and PM pollution levels and deepen the understanding of urban air pollutant evolution.

更新日期：2024-04-27

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