Seasonal Changes in the Oxidative Potential of Urban Air Pollutants: The Influence of Emission Sources and Proton- and Ligand-Mediated Dissolution of Transition Metals.

Autor: Shahpoury P; Environmental and Life Sciences, Trent University, Peterborough K9L0G2, Canada., Lelieveld S; Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz 55128, Germany., Srivastava D; Division of Environmental Health and Risk Management, School of Geography, Earth & Environmental Sciences, University of Birmingham, Edgbaston, Birmingham B152TT, United Kingdom., Baccarini A; Laboratory of Atmospheric Processes and their Impacts, School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland., Mastin J; Air Quality Processes Research Section, Environment and Climate Change Canada, Toronto M3H5T4, Canada., Berkemeier T; Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz 55128, Germany., Celo V; Analysis and Air Quality Section, Environment and Climate Change Canada, Ottawa K1V1C7, Canada., Dabek-Zlotorzynska E; Analysis and Air Quality Section, Environment and Climate Change Canada, Ottawa K1V1C7, Canada., Harner T; Air Quality Processes Research Section, Environment and Climate Change Canada, Toronto M3H5T4, Canada., Lammel G; Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz 55128, Germany., Nenes A; Laboratory of Atmospheric Processes and their Impacts, School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland.; Institute of Chemical Engineering Sciences, Foundation for Research and Technology Hellas, Patras GR-26504, Greece.
Jazyk: angličtina
Zdroj: ACS ES&T air [ACS EST Air] 2024 Aug 29; Vol. 1 (10), pp. 1262-1275. Date of Electronic Publication: 2024 Aug 29 (Print Publication: 2024).
DOI: 10.1021/acsestair.4c00093
Abstrakt: The inhalation of fine particulate matter (PM 2.5 ) is a major contributor to adverse health effects from air pollution worldwide. An important toxicity pathway is thought to follow oxidative stress from the formation of exogenous reactive oxygen species (ROS) in the body, a proxy of which is oxidative potential (OP). As redox-active transition metals and organic species are important drivers of OP in urban environments, we investigate how seasonal changes in emission sources, aerosol chemical composition, acidity, and metal dissolution influence OP dynamics. Using a kinetic model of the lung redox chemistry, we predicted ROS (O 2 •- , H 2 O 2 , • OH) formation with input parameters comprising the ambient concentrations of PM 2.5 , water-soluble Fe and Cu, secondary organic matter, nitrogen dioxide, and ozone across two years and two urban sites in Canada. Particulate species were the largest contributors to ROS production. Soluble Fe and Cu had their highest and lowest values in summer and winter, and changes in Fe solubility were closely linked to seasonal variations in chemical aging, the acidity of aerosol, and organic ligand levels. The results indicate three conditions that influence OP across various seasons: (a) low aerosol pH and high organic ligand levels leading to the highest OP in summer, (b) opposite trends leading to the lowest OP in winter, and (c) intermediate conditions corresponding to moderate OP in spring and fall. This study highlights how atmospheric chemical aging modifies the oxidative burden of urban air pollutants, resulting in a seasonal cycle with a potential effect on population health.
Competing Interests: The authors declare no competing financial interest.
(Crown © 2024. Published by American Chemical Society.)
Databáze: MEDLINE
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