Oct 2026· Science Advances· Vol 12· 0 citations· 92 references
Medicine
Abstract
Urban air quality is affected by diverse volatile organic compounds (VOCs), and prior studies reveal a need to understand their seasonal sources. We combine high-resolution mass spectrometry with eddy covariance to quantify VOC fluxes from an urban/suburban New York site during summer and winter. Emissions are strongly seasonal: During summer, twice as many VOCs undergo surface-atmosphere exchange, and molar and reactivity-based fluxes are 2 to 4× higher than in winter. Temperature-dependent emissions from volatile chemical products (VCPs), vegetation, and residences dominate during summer. Ethanol alone accounts for ∼25% of the total flux. During winter, temperature-dependent emissions are reduced and traffic sources dominate. An updated inventory agrees with summer observations within 40% but overestimates winter fluxes by >2.5×. The winter discrepancy reflects overestimated VCP/cooking emissions and missing temperature-dependent volatilization. Results highlight the need to account for seasonal and temperature-dependent urban emissions to support pollution and mitigation assessment in the context of global change.
Abstract. Biogenic volatile organic compounds (BVOCs) substantially influence regional photochemical air pollution, climate, and the carbon cycle. However, observational constraints on BVOC emissions from urban or suburban forests in Asian megacity regions under humid subtropical climates remain limited. In this study,...
Yujiro Ichikawa, K. Yoshida, Shin-ichi Yonemochi et al.· Atmospheric Chemistry and Ph...· 0 citations
Secondary nitrate is a major driver of wintertime PM2.5 pollution in China, yet the coupled photochemical and heterogeneous controls on its formation remain poorly constrained in humid, topographically confined basins. Here, we combined wintertime field observations with a box model and thermodynamic calculations to...
In this study, we evaluated the influence of COVID-19 social restrictions on tropospheric ozone (O₃) concentrations in Pelotas, a mid-sized city in southern Brazil, aiming to understand how anthropogenic emission reductions and seasonal climate patterns modulate urban air quality in the South American context. Using a...
Márcio Francisco Denzer Krüger, Marcelo Felix Alonso, Rose Ane Pereira de Freitas et al.· Revista Brasileira de Geogra...· 0 citations
Ground-level ozone (O3) pollution remains a critical air quality challenge in China, with volatile organic compounds (VOCs) serving as key precursors. However, the photochemical loss of VOCs during atmospheric transport introduces substantial biases in source apportionment and O3 formation potential (OFP) assessments,...
Yao Mao, Yu-Fei Zhang, Jin-Lun Li et al.· Environmental Pollution· 0 citations
Oxygenated Organic Molecules (OOMs) represent a substantial fraction of ambient reactive carbon and are potential precursors of secondary organic aerosols (SOA). Surface-atmosphere exchange flux modulates OOM budgets and subsequent SOA formation. This study presents the first urban eddy covariance measurements of ppt...
Jie-Ya Sun, Xin-Yu Wang, Jing-Ya Hua et al.· Atmospheric Chemistry and Ph...· 0 citations
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