Atmospheric Environment最新文献

{"title":"Deposition rates and air concentrations of tire and road wear particles near a motorway in Germany","authors":"Stephan Weinbruch,&nbsp;Jeannette Matthies,&nbsp;Linyue Zou,&nbsp;Konrad Kandler,&nbsp;Martin Ebert,&nbsp;Moritz Bigalke","doi":"10.1016/j.atmosenv.2025.121228","DOIUrl":"10.1016/j.atmosenv.2025.121228","url":null,"abstract":"<div><div>Tire and road wear particles (TRWP) are an important component of non-exhaust emissions from road traffic. They are internal mixtures of tire material, road wear, brake wear, and soil minerals. In contrast to tire material analysed by bulk analytical techniques, there is little literature on the air concentrations and deposition rates of TRWP. The main purpose of our study was to determine deposition rates and air concentrations of TRWP at a motorway in Germany. TRWP were collected with passive samplers and analysed by scanning electron microscopy. Number deposition rates varied between approximately 100 particles cm⁻² day⁻¹ at 3.5 m distance and 30 particles cm⁻² day⁻¹ at 30.5 m distance from the road, and mass deposition rates between 7.8 mg m⁻² day⁻¹ and 2.8 mg m⁻² day⁻¹, respectively. Air concentrations of TRWP calculated from the mass deposition rates varied between approximately 3.8 μg/m³ (3.5 m distance) and 0.95 μg/m³ (30.5 m distance). The influence of potential particle misclassification, density of TRWP, and volume approximation on the deposition rates and air concentrations is small. Air concentrations of TRWP observed in this study are reasonably consistent with the results of previous electron microscopy studies, but are significantly higher than the values used in risk assessment. This discrepancy clearly shows that further exposure measurements are required. The input of organic additives such as benzothiazole and N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine (6PPD) as well as carbon, sulfur and zinc through deposition in road soils should be taken into account when assessing the environmental impact of TRWP.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"352 ","pages":"Article 121228"},"PeriodicalIF":4.2,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of chemical and bioreactivity properties of photooxidation reaction products from secondary organic aerosols (SOA) under high OH exposure condition","authors":"Ka Hei Lui ,&nbsp;Xinye Zhu ,&nbsp;Yik-Sze Lau ,&nbsp;Tianhang Zhang ,&nbsp;Gehui Wang ,&nbsp;Hsiao-Chi Chuang ,&nbsp;Kin Fai Ho","doi":"10.1016/j.atmosenv.2025.121212","DOIUrl":"10.1016/j.atmosenv.2025.121212","url":null,"abstract":"<div><div>The chemical and bioreactivity properties of photooxidation products emitted during high radical exposure conditions were characterized. The purpose was to simultaneously investigate the influences of the toxicity of photooxidation products from common anthropogenic and biogenic precursors (toluene, <em>m</em>-xylene and isoprene). The major ring-opening compounds were identified as pyruvic acid (C₃H₄O₃), glyceric acid (C₃H₆O₄), succinic acid (C₄H₆O₄), malic acid (C₄H₆O₅), tartaric acid (C₄H₆O₆), 2,3-dihydroxy-glutaric acid (C₅H₈O₆), glycolic acid (C₂H₄O₃) and oxalic acid (C₂H₂O₄) originated from the toluene and xylene-derived secondary organic aerosol (SOA) products in the analysis. The average LDH level from isoprene-derived SOA (0.77 μg/ml) was higher than the control (0.75 μg/ml) and the DCFH level from isoprene-derived SOA (228.73 RFU) was also higher than the control (215.18 RFU). In addition, the average LDH level from toluene-derived SOA (0.86 μg/ml) was higher than the isoprene (0.77 μg/ml). The IL-6 level from toluene-derived SOA (182.82 pg/ml) was higher than the xylene-derived SOA (173.00 pg/ml). These suggested enhanced cytotoxicity and cell membrane damage under toluene-derived SOA exposure. The isoprene-derived SOA induced higher DCFH levels of (228.73 RFU), implying the potential effects of particulate matter from SOA on the oxidative potential and rising cellular oxidant burden. The overall results suggest that the oxidation products can potentially cause various cytotoxic effects. This finding warrants further investigation into the toxicity profiles of SOA and regulation of SOA pollution.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"352 ","pages":"Article 121212"},"PeriodicalIF":4.2,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deducing atmospheric conditions that contribute to elevated pollution events in the Salton Sea Air Basin","authors":"Heather C. Lieb ,&nbsp;Ian C. Faloona","doi":"10.1016/j.atmosenv.2025.121191","DOIUrl":"10.1016/j.atmosenv.2025.121191","url":null,"abstract":"<div><div>The Salton Sea Air Basin (SSAB) has struggled to comply with National Ambient Air Quality Standards (NAAQS) for three federally regulated air pollutants: ozone, PM_2.5, and PM₁₀. Seasonal and diurnal patterns are presented along with their long-term decadal trends to better understand the relationship between the meteorological setting and air pollution levels as well as their deviations. This analysis revealed that ozone exceedances are no longer dominated by regulated NO_x emissions but rather are primarily controlled by regional agricultural soil emissions. These emissions are also likely influenced by stratospheric ozone transport to the deep convective boundary layers unique to the area. Observed peak ozone levels are still ∼2–5 ppb lower on weekends indicative of a NO_x-limited regime during the warm season. This implies that local ozone production is directly dependent on NO_x levels, which emphasizes the need to address unregulated sources of NO_x pollution such as those from heavily fertilized, arid agricultural soils. Additionally, strong correlations of PM_2.5 with NO_x, PM₁₀, and CO, indicate that influences from combustion sources as well as agricultural soils, secondary formation, and mechanical processes are all important sources of PM_2.5 production in Calexico, the main city of PM_2.5 nonattainment on the southern border with Mexico. These PM_2.5 exceedances occur in winter months, when low ventilation accumulates localized PM_2.5 precursor emissions. Source apportionment of PM_2.5 was assessed using non-negative matrix factorization of data from the Chemical Speciation Network (CSN) site in Calexico. The CSN data analysis for Calexico identifies biomass burning as the dominant source of high PM_2.5 concentrations, followed by agricultural soil emissions and wind-blown dust. In the immediate vicinity of the Salton Sea, less frequent PM_2.5 exceedances seem to be associated with occasional windstorms. Further, analysis of PM₁₀ exceedance days indicates that high winds, primarily westerly, are a critical factor, and the low PM_2.5/PM₁₀ ratios suggest minimal contribution from photochemical or combustion sources. Furthermore, the correlation of PM₁₀ with wind speed across various sites underscores the importance of dust resuspension and soil erosion. This comprehensive assessment highlights the complexity of air quality problems in the SSAB. Additionally, it emphasizes the need for targeted and localized air quality management strategies for this region which, despite its low population, suffers some of the worst air pollution impacts in the state of California.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"352 ","pages":"Article 121191"},"PeriodicalIF":4.2,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143824294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Drivers for the trends of atmospheric inorganic nitrogen deposition in China under the past and future scenarios","authors":"Zihan Zhang ,&nbsp;Dan Yan ,&nbsp;Mengmeng Li ,&nbsp;Yuting Lu ,&nbsp;Yiting Zhou ,&nbsp;Tijian Wang ,&nbsp;Bingliang Zhuang ,&nbsp;Shu Li ,&nbsp;Xin Huang","doi":"10.1016/j.atmosenv.2025.121221","DOIUrl":"10.1016/j.atmosenv.2025.121221","url":null,"abstract":"<div><div>Atmospheric inorganic nitrogen deposition has changed dramatically across China over the recent decades, exerting profound impacts on regional climate and ecosystem. Here we present an observation- and model-based analysis to disentangle the trends of atmospheric inorganic nitrogen deposition in China, in response to the emission and climate changes, under the past (2013–2022) and future (2020–2050) scenarios. Both observational evidence and model results indicate an obvious declining trend of the national-average inorganic nitrogen deposition across China from 19.31 kg N ha⁻¹ yr⁻¹ to 14.64 kg N ha⁻¹ yr⁻¹ (−24.2 %) between 2013 and 2022, of which wet and dry deposition declines by −15.8 % and −33.4 %, respectively. Using a series of regional climate-chemistry coupled simulations, we find that the declined inorganic nitrogen deposition in 2013–2022 results comparably from the recent emission changes (69.8 % for oxidized nitrogen and 48.1 % for reduced nitrogen) and precipitation decreases. We further predict a significant decrease in inorganic nitrogen deposition under the SSP245 (−39.18 %) and SSP585 (−47.33 %) scenarios in the near-future. Overall, the contribution of emission reductions surpasses that of climatic changes and dominates the projected declining trends in inorganic nitrogen deposition. This paper provides some important insights into the drivers of atmospheric inorganic deposition in China and lays the foundation for assessing the effectiveness of emission control policies on atmospheric nitrogen deposition reduction.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"352 ","pages":"Article 121221"},"PeriodicalIF":4.2,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The future underlying differential response of surface ozone to biogenic emissions in China (2019–2060)","authors":"Wenpeng Wang ,&nbsp;Ying Wang ,&nbsp;Xiangyue Chen ,&nbsp;Xiaodong Zhang ,&nbsp;Tan Xu ,&nbsp;Yuan Zhao ,&nbsp;Lei Ma ,&nbsp;Bolong Chen ,&nbsp;Hongchao Zuo","doi":"10.1016/j.atmosenv.2025.121206","DOIUrl":"10.1016/j.atmosenv.2025.121206","url":null,"abstract":"<div><div>China's major megacity clusters experience severe summer ozone pollution, posing significant public health risks. In the context of declining anthropogenic emissions and increasing biogenic emissions driven by climate warming, understanding future surface ozone trends and their response to biogenic emissions is critical. This study integrates advanced biogenic emission and geochemical models to assess the impact of vegetation changes on ozone pollution in key regions—Beijing-Tianjin-Hebei (JJJ), Shandong (SDC), Chengdu-Chongqing (CCC), Fenwei Plain (FWP), Mid-Yangtze (MYC), Guangdong-Hong Kong-Macao Greater Bay Area (GHM), and Yangtze River Delta (YRD)—under 2030 and 2060 climate scenarios. Results demonstrate intensified ozone pollution by 2030 in GHM, MYC, FWP, and SDC, and by 2060 in JJJ, FWP, and GHM. The Random Forest model attributes ∼76.0 % of future ozone changes to biogenic emissions. Ozone source apportionment (OSAT) and brute force (BF) methods reveal increasing biogenic contributions to ozone formation in most scenarios. Mechanistic analysis shows biological nitrogen oxides (BNO_x) play a larger role than biogenic volatile organic compounds (BVOCs), especially in northern China with high nitrogen fertilizer use. While rising BVOCs increase RO₂ radicals, their ozone impact depends on NO_x levels: in NO_x-rich regions, BVOCs promote ozone via RO₂+NO reactions; in NO_x-scarce regions, RO₂+HO₂ reactions dominate, reducing ozone through competitive effects. This effect is observed in megacity clusters when P(H₂O₂)/P(HNO₃) exceeds 9. Overall, this study highlights the pivotal role of biogenic emissions in shaping China's future ozone pollution under climate and vegetation changes.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"352 ","pages":"Article 121206"},"PeriodicalIF":4.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143824295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A review on atmospheric aerosols and dusts in different tropical forest ecosystems and policy recommendations toward climate resilience","authors":"Arika Bridhikitti ,&nbsp;Weerachon Sawangproh ,&nbsp;Tomoki Nakayama","doi":"10.1016/j.atmosenv.2025.121215","DOIUrl":"10.1016/j.atmosenv.2025.121215","url":null,"abstract":"<div><div>A significant challenge exists in the interconnections among tropical forests, aerosols, and climate resilience, as aerosols profoundly influence weather patterns and air quality. Emissions from forest fires and deforestation increase aerosol concentrations, disrupting cloud formation and precipitation, which undermines the ability of tropical forests to purify air, sequester carbon, and support biodiversity. This review aims to synthesize recent research on aerosol science related to tropical forest ecosystems and their roles in air quality and climate regulation. This review highlights the role of biogenic volatile organic compounds (BVOCs)—such as isoprene, monoterpenes, and sesquiterpenes—in ozone formation and secondary organic aerosol (SOA) generation in tropical forests. Biomass burning and anthropogenic emissions enhance BVOC oxidation, altering SOA characteristics like particle size and hygroscopicity. Land cover changes, such as converting forests to plantations, also affect BVOC emissions, potentially increasing ozone levels in the upper troposphere. Additionally, the review explores hydrogen sulfide emissions from mangrove forests, emissions of primary biological aerosol particles, and the impacts of soil dust and mineral aerosols from regions including the Amazon and Southeast Asia. The effects of biomass burning in these areas vary by combustion efficiency and fuel types, with implications for cloud dynamics and air quality. Moreover, key transport routes, such as trans-Atlantic movements of African smoke, exacerbate aerosol impacts on soil fertility and air quality. In Southeast Asia, biomass burning increases particulate matter, impacting air quality and regional climate. Finally, policy recommendations and current research gaps are presented to help policymakers and scientists enhance sustainable forest management toward climate resilience in tropical ecosystems amid ongoing environmental changes.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"352 ","pages":"Article 121215"},"PeriodicalIF":4.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Non-negligible emissions of amines from vehicle and ship exhausts in China","authors":"Dazhou Li ,&nbsp;Xinfeng Wang ,&nbsp;Jing Chen ,&nbsp;Chunying Lu ,&nbsp;Shuwei Dong ,&nbsp;Zhiyi Liu ,&nbsp;Min Li ,&nbsp;Likun Xue ,&nbsp;Wenxing Wang","doi":"10.1016/j.atmosenv.2025.121220","DOIUrl":"10.1016/j.atmosenv.2025.121220","url":null,"abstract":"<div><div>Amines have significant impacts on air quality, regional climate, and human health. To date, the emissions of amines from traffic sources remain unclear. In this study, we collected fine particulate matters from vehicle and ship exhausts, and subsequently characterized the emissions of 17 amines using ultra-performance liquid chromatography-mass spectrometry. The concentrations and composition of particulate amines vary depending on the types of vehicles and ships. Trimethylamine and 2-Amino-1-butanol were predominant in vehicle exhausts, whereas dimethylamine and diethylamine were prominent in ship exhausts. Diesel vehicles exhibited the highest levels of total amines, followed by gasoline vehicles and compressed natural gas vehicles. Small ships emitted significantly more amines than large ones, with amine concentrations decreasing as engine power increased. Amines emissions from vehicles and ship's exhausts were hypothesized to originate primarily from the three-way-catalyst, selective catalytic reduction, or exhaust gas recirculation systems in the presence of ammonia and organic compounds. Based on the determined emission factors, the annual emissions of fine particulate amines from vehicles and ships in China were approximately 312 kg and 534 kg, respectively. According to the gas particle partitioning coefficient from field measurements, the annual emissions of gaseous amines from vehicles and ships in China were estimated to be 4.2–12.0 Mg and 7.2–20.5 Mg, respectively. Overall, this study presents the unique emission characteristics of particulate amines from vehicle and ship exhausts and confirms the non-negligible emissions from traffic sources.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"352 ","pages":"Article 121220"},"PeriodicalIF":4.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143776421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aerosolisation of new generation perfluoroalkyl ether carboxylic and sulfonic acids from aeration of contaminated aqueous solutions","authors":"Jishnu Pandamkulangara Kizhakkethil,&nbsp;Ivan Kourtchev","doi":"10.1016/j.atmosenv.2025.121218","DOIUrl":"10.1016/j.atmosenv.2025.121218","url":null,"abstract":"<div><div>There has been an industrial shift towards replacing legacy per- and polyfluoroalkyl substances (PFAS) with perfluoroalkyl ether carboxylic and sulfonic acids (PFECA and PFESA) including hexafluoropropylene oxide dimer acid (HFPO-DA), also known as GenX. These compounds have been detected in the atmosphere but their potential sources remain poorly understood.</div><div>In this study, aerosolisation of six PFECA and PFESA from PFAS-contaminated water at concentrations and pHs representative of industrial sewage was investigated. All studied PFECA and PFESA were observed in the aerosols from the aeration of PFAS-fortified water at pH 6, 7 and 8. The aerosolisation behaviour of PFECA and PFESA increased with the analyte's carbon chain length and was influenced by the PFAS functional groups and pH of the aerated solution. PFESA with sulfonic acid groups aerosolised more from the solutions than PFECA with carboxylic acid groups. The ability of new generation PFAS to transfer from contaminated waters and become airborne (aerosolise up to a mass fraction 30.4 ± 2.7 %) raises concerns due to their potential health and environmental impacts. Our findings indicate that industrial and water management processes involving aeration of water contaminated with PFECA and PFESA could serve as potential sources of new-generation atmospheric PFAS.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"352 ","pages":"Article 121218"},"PeriodicalIF":4.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of NO2 diffusion tube measurement methods and related uncertainties","authors":"David Medland ,&nbsp;Gabriel Garcia ,&nbsp;Tom Gardiner ,&nbsp;Nicholas A. Martin ,&nbsp;Valerio Ferracci ,&nbsp;Ashley Wilkins ,&nbsp;David Fryer ,&nbsp;Tom Holmes ,&nbsp;Pete Edwards ,&nbsp;Sebastian Diez ,&nbsp;David Butterfield","doi":"10.1016/j.atmosenv.2025.121219","DOIUrl":"10.1016/j.atmosenv.2025.121219","url":null,"abstract":"<div><div>Conventional Palmes Diffusion Tubes (PDTs) are extensively employed by UK Local Authorities for measuring NO₂ in air quality monitoring studies. These devices are known to suffer from biases due to from the effects of wind speed. Modified PDTs with wind protective filters have also been developed for deployment in the UK Urban NO₂ Network (UUNN) with an improved measurement accuracy and repeatability. We report the performance of the two designs and also when enclosed in additional shelters. The comparison was carried out against simultaneous reference measurements and was evaluated through a statistical and modelled uncertainty. The model incorporated the individual components of the measurement uncertainty to provide an estimate of the total measurement uncertainty and identified which elements could be reduced across mean values of multiple measurements.</div><div>We found that conventional PDTs could be adversely affected by wind speed and that the incorporation of shelters delivered improved repeatability and better accuracy across multiple diffusion tube measurements. The UUNN style diffusive samplers were more accurate than the PDTs and had better repeatability. The additional use of shelters with UUNN style samplers made no discernible difference to the measurements.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"352 ","pages":"Article 121219"},"PeriodicalIF":4.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of the oxidation of non-methane volatile organic compounds on tropospheric hydrogen: A STOCHEM-CRI global Lagrangian model study","authors":"Richard G. Derwent ,&nbsp;Michael E. Jenkin ,&nbsp;David S. Stevenson ,&nbsp;Steven R. Utembe ,&nbsp;Anwar H. Khan ,&nbsp;Dudley E. Shallcross","doi":"10.1016/j.atmosenv.2025.121214","DOIUrl":"10.1016/j.atmosenv.2025.121214","url":null,"abstract":"<div><div>In this study, a global Lagrangian chemistry-transport model, STOCHEM-CRI, was employed to study the formation of hydrogen (H₂) from the oxidation of twenty anthropogenic and natural biogenic non-methane volatile organic compounds (VOCs). The base case STOCHEM-CRI model was perturbed by applying a step-change to the emissions of each VOC in turn. Differences between each perturbed case and the base case were used to derive the responses in the fluxes through the formaldehyde photolysis source of H₂ and in the oxidation rate of each VOC. H₂ yields were largest for the natural biogenic VOCs: isoprene, α- and β-pinene and least, close to zero, for ethyne and benzene. Differences in yields were driven by the number of carbon atoms, by the chemical mechanisms of the hydroxyl radical and ozone reactions and by the involvement of long-lived oxidation products. These responses were then used to estimate the global H₂ source strengths from the oxidation of anthropogenic and natural biogenic VOCs. Ethene oxidation dominated the global H₂ source from the oxidation of anthropogenic VOCs, totalling 1.6 Tg yr⁻¹. Isoprene oxidation dominated the natural biogenic VOC oxidation source, totalling 20 Tg yr⁻¹, over ten times higher than the anthropogenic source. Uncertainties in the VOC oxidation source of H₂ make a considerable contribution to the uncertainties in the global warming potentials for H₂ estimated with current chemistry-transport models.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"352 ","pages":"Article 121214"},"PeriodicalIF":4.2,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}