Atmospheric Environment最新文献

{"title":"Interaction between extreme temperature events and ozone on mortality: Evidence from a time-stratified case-crossover study","authors":"Wenqiang Zhan ,&nbsp;Rongrong Han ,&nbsp;Wu Wang ,&nbsp;Liping Fang ,&nbsp;Jieyu Zhang ,&nbsp;Xingxing Xu","doi":"10.1016/j.atmosenv.2025.121580","DOIUrl":"10.1016/j.atmosenv.2025.121580","url":null,"abstract":"<div><div>Mounting evidence links ozone (O₃) and extreme temperature events (ETEs) to increased mortality, yet the interaction between these factors remains poorly understood. This study investigates the relationship between ambient maximum 8-h moving average ozone concentrations (O₃-8h) and exposure to heatwaves and cold spells, and their impact on non-accidental, cardiovascular, and respiratory mortality. Using a case-crossover design, we analyzed 248,060 non-accidental deaths in Qingpu, Shanghai, China, from 2012 to 2019. Heatwaves and cold spells were defined as periods of sustained extreme temperatures lasting more than two consecutive days. Various temperature thresholds and durations were used to define these events at the grid level. Conditional logistic regression models were employed to assess exposure-response relationships and additive interactions. The odds ratio (OR) for non-accidental mortality associated with low O₃-8h concentrations during heatwaves (defined as P92.5_3d) was 1.096 (95 % CI: 0.954, 1.260), compared to low O₃-8h without heatwave exposure. During heatwaves, the OR was 1.046 (95 % CI: 1.007, 1.086). Significant synergistic effects were observed between heatwaves and ozone exposure on respiratory and non-accidental mortality (RERI &gt;0, AP &gt; 0, S &gt; 1). No significant interaction was found between cold spells and ozone exposure. Ozone and heatwaves accounted for approximately 1.9 %, 1.3 %, and 3.1 % of non-accidental, cardiovascular, and respiratory deaths, respectively. These findings suggest that heatwaves and ozone exposure significantly increase mortality risk, with a synergistic effect exacerbating the risk.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"362 ","pages":"Article 121580"},"PeriodicalIF":3.7,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145263226","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":"Long-term continuous observations and trend analyses of transboundary air pollutants from the Asian continent at Suzu on the Noto Peninsula, Japan","authors":"Yasuhiro Sadanaga ,&nbsp;Yuki Onishi ,&nbsp;Akie Yuba ,&nbsp;Keiichi Sato ,&nbsp;Hiroshi Shiigi ,&nbsp;Atsushi Matsuki","doi":"10.1016/j.atmosenv.2025.121601","DOIUrl":"10.1016/j.atmosenv.2025.121601","url":null,"abstract":"<div><div>Long-term continuous observations of the concentrations of total odd nitrogen (NO_<em>y</em>), total nitrate (T.NO₃), CO, and O₃ were performed at Suzu on the Noto Peninsula in Japan for almost 14 years (November 2009 to April 2023). The long-term trends and seasonal variations of these concentrations were analyzed. Concentrations of NO_<em>y</em>, T.NO₃, CO, and O₃ showed decreasing trends throughout the observation period, which reflects recent reductions in emissions of air pollutants on the Asian continent. The average concentrations and number of high concentration outliers extracted by the trend analyses for NO_<em>y</em>, T.NO₃, CO, and O₃ were high in spring, whereas those in winter were high for CO and low for NO_<em>y</em>, T.NO₃, and O₃. These seasonal variations occurred because of wet removal of T.NO₃ by high precipitation on the Sea of Japan coast for NO_<em>y</em> and T.NO₃ and low photochemical activity for O₃ in winter. The percentage contributions of air masses of different origins observed for the high concentration outliers showed concentration variations of NO_<em>y</em>, T.NO₃, and O₃ at Suzu were influenced by air masses from Japan and the Asian continent.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"363 ","pages":"Article 121601"},"PeriodicalIF":3.7,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145264942","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":"Atmospheric organophosphate esters in the urban environment: Seasonal trend, diurnal variation, and risk assessment","authors":"Nelly Marlina ,&nbsp;Chi Pan ,&nbsp;Cat Tuong Le Tong ,&nbsp;Anggraini Widyastuti ,&nbsp;Marwa Daud Abada Robby ,&nbsp;Ruei-Feng Shiu ,&nbsp;Tetsuro Agusa ,&nbsp;Admir Créso Targino ,&nbsp;Jheng-Jie Jiang","doi":"10.1016/j.atmosenv.2025.121600","DOIUrl":"10.1016/j.atmosenv.2025.121600","url":null,"abstract":"<div><div>Organophosphate esters (OPEs) are widespread environmental contaminants used primarily as flame retardants and plasticizers, yet their fate remains poorly understood. This study comprehensively examined OPEs in indoor and outdoor air in urban environments, focusing on concentrations, seasonal patterns, and health risks. Seventeen OPEs, including aryl, alkyl, and chlorinated types, were analyzed in fine particulate matter (PM_2.5) and the gas phase over a year-long sampling campaign. Outdoor gas phase OPE concentrations ranged from 0.04 to 2.68 ng/m³, while particulate concentrations varied from 0.07 to 0.49 ng/m³. Indoor gas phase concentrations were higher, ranging from 0.13 to 7.84 ng/m³, and particulate concentrations from 0.08 to 1.26 ng/m³. Chlorinated OPEs dominated the gas phase, whereas alkyl OPEs were more prevalent in the particulate phase. Seasonal variations revealed elevated OPE levels in spring and summer, attributed primarily to increased volatilization and marine-derived air masses, whereas winter concentrations were the lowest and occasionally linked to long-range transport from northeastern China. Diurnal measurements indicated that indoor gas phase OPE concentrations were higher during daytime, coinciding with increased human activities and elevated indoor temperatures. Principal component analysis suggested local industrial emissions and regional transport from Southeast Asia and Northeast China as key sources. Estimated daily intake (EDI) values for children exceeded those for adults, indicating greater vulnerability. However, hazard quotient (HQ) values for both groups remained below unity, implying low non-carcinogenic inhalation risk. These findings highlight the importance of continued monitoring and source control of OPEs, especially in indoor environments where human exposure is most pronounced.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"362 ","pages":"Article 121600"},"PeriodicalIF":3.7,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145263223","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":"Effects of different aerosol types on surface UV radiation in the 21st century","authors":"A. Chatzopoulou ,&nbsp;K. Tourpali ,&nbsp;A.F. Bais ,&nbsp;P. Braesicke","doi":"10.1016/j.atmosenv.2025.121595","DOIUrl":"10.1016/j.atmosenv.2025.121595","url":null,"abstract":"<div><div>This study aims at quantifying the effect of different aerosol types on sunburning solar ultraviolet (UV) radiation, quantified by the UV Index (UVI), using global simulations with a radiative transfer model which are based on aerosol optical depth data derived from the GFDL-ESM4 model. The reductions in UV radiation due to the presence of aerosols show a strong regional variability, with the largest effect caused by organic aerosols and dust, followed by black carbon, while sulfates and sea salt have a minor influence. In the 1950s and 1990s decreases in the UVI are dominated by the presence of organic aerosols mainly over Western S. America (−3.9 UVI units) and South and East Asia (−1.9), as well as by dust in Northern Africa (−3.8). Despite its low optical depth (0.08), the effect of black carbon on UVI is significant in specific regions (e.g., Central Africa and South and East Asia in the 1950s and India in the 1990s.</div><div>Aerosol decreases from the 1990s to the 2090s under the SSP1–2.6 scenario result in UVI increases, by up to ∼5 over South and East Asia due to decreases in organics and black carbon. Under SSP3–7.0, the UVI changes are mostly negative worldwide, primarily due to increases in organics. Finally, under SSP5–8.5, UVI increases mainly in Asia, Europe, and the Southern S. America due to decreases in black carbon, sulfates, dust and organics, while in other regions the UVI changes are negative driven by increases in organics.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"362 ","pages":"Article 121595"},"PeriodicalIF":3.7,"publicationDate":"2025-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145263104","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":"Retrieval of satellite-derived black carbon concentration and mitigation approaches for Karnataka, India","authors":"Narayan Kayet ,&nbsp;Likitha M P ,&nbsp;Akshay Kumar V G ,&nbsp;Geeta Hegde ,&nbsp;Tejaswini Eregowda ,&nbsp;Chandana M C","doi":"10.1016/j.atmosenv.2025.121591","DOIUrl":"10.1016/j.atmosenv.2025.121591","url":null,"abstract":"<div><div>Black carbon (BC) is a short-lived climate pollutant that adversely impacts human health, regional air quality, and climate. Accurate monitoring of its spatiotemporal variability remains a challenge due to limited ground-based observations. This study develops a high-resolution (1 × 1 km) dataset of annual BC columnar concentrations across Karnataka, India, for 2018–2024 by combining satellite retrievals of aerosol optical depth (AOD), carbon monoxide (CO), and nitrogen dioxide (NO₂) with ground-based BC observations using regression modeling. Results show a consistent rise in annual BC concentrations of 0.2–0.5 μg/m³ per year, except in 2020 when emissions decreased due to pandemic-related restrictions. District-level analysis identifies Kalaburagi, Raichur, Ballari, Bengaluru Urban, and Vijayanagara as major BC hotspots. Sectoral contributions indicate Industry (46.4 %) and Road Transport (39.8 %) as dominant sources, with smaller shares from Residential (6.8 %), Forest Fires (3.5 %), Stubble Burning (2.4 %), and miscellaneous activities (1.2 %). Model evaluation demonstrates moderate agreement between estimated BC and independent datasets, with R² = 0.65 and RMSE = 0.49 against ground-based measurements, and coefficient of determination (R²) = 0.57 and Root Mean Square Error (RMSE) = 0.66 compared to Modern-Era Retrospective Analysis for Research and Applications (MERRA-2) reanalysis data for 2024. The high-resolution BC maps and hotspot and sectoral analyses provide improved spatial detail compared to reanalysis products or chemical transport models. These results highlight the growing BC b urden in Karnataka, the need for targeted mitigation in industrial and transport sectors, and the value of satellite-based approaches in supporting evidence-based air quality and climate policies.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"362 ","pages":"Article 121591"},"PeriodicalIF":3.7,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145263225","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":"An investigatory study and risk assessment for the existence of hazardous volatile organic compounds in Kala Sanghian Drain, Punjab, India","authors":"Anju Mangotra","doi":"10.1016/j.atmosenv.2025.121593","DOIUrl":"10.1016/j.atmosenv.2025.121593","url":null,"abstract":"<div><h3>Background</h3><div>Kala Sanghian Drain, Punjab, India, receives the chemicals from the leather industries, motor bearings industries, electroplating industries, and textile industries situated on its side. This drain becomes a source of physiological disturbance, such as skin diseases, respiratory problems, peripheral neuropathy, and neurotic symptoms in the community living near it. These become a bed of carcinogenic and mutagenic agents, too.</div></div><div><h3>Methods</h3><div>To analyze the presence of toxic volatile organic compounds in the industrial effluent of Kala Sanghian Drain, gas chromatography equipped with triple quadrupole mass spectrometry (GC-QqQ-MS/MS) was used. The four sites along the length of the drain, having a hub of industries, were chosen for the collection of samples. The samples were collected in triplicate.</div></div><div><h3>Results</h3><div>Eleven volatile organic compounds have been detected from four sites (LO, LD, FD, and BD) of the Kala Sanghian Drain (KSD). The identified volatile organic compounds were 1, 3, 5-Trimethylbenzene, p-isopropyltoluene, bromobenzene, cumene, ethylbenzene, carbon tetrachloride, cis-1, 2-dichloroethene, heptane, dichloromethane, 1, 1, 1-trichloroethane, and tetrachloromethane. The most frequently occurring volatile organic compounds across the sites were heptane, dichloromethane, and cis-1, 2-dichloroethene. The highest number of volatile organic compounds was observed in Site 3 (FD) with eight organic compounds. Heptane was identified with the highest total concentration of 619.3 ng/ml. On the contrary, cumene was present with the lowest concentration of 10.11 ng/ml. The identified volatile organic compounds belong to the benzene series, chlorinated hydrocarbons, chlorinated benzene, and alkane.</div></div><div><h3>Public health relevance</h3><div>Industrialization and urbanization are colossal sources of pollutants in the environment, especially in water bodies. The highly polluted drains of developing countries are impairing the normal parameters of the water bodies. At the study site, where the hazardous chemicals are released into the drain, there is no air monitoring. These toxic compounds not only become a hazard for the residents but also manipulate the aquatic life and the agriculture sector. The Sutlej River and the ocean are the next destinations for this outflow. In this sense, it affects aquatic and human life worldwide, either directly or indirectly. Our research emphasizes how important environmental monitoring is to preserving human life.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"362 ","pages":"Article 121593"},"PeriodicalIF":3.7,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145263222","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":"Characteristics, influencing factors, and risk assessment of indoor dustfall microplastics: Emphasizing the elevated risks of fragmented forms","authors":"Yaxin Cao ,&nbsp;Wingkei Ho ,&nbsp;Longyi Shao ,&nbsp;Huachang Hong ,&nbsp;Wen-Jing Deng","doi":"10.1016/j.atmosenv.2025.121586","DOIUrl":"10.1016/j.atmosenv.2025.121586","url":null,"abstract":"<div><div>Microplastics (MPs) are a significant environmental pollutant, and the indoor environment serves as both a source and a medium for human exposure to these particles. The influence of different MP shapes on health risks, particularly concerning intestinal absorption, remains poorly understood. This study investigated MPs in indoor dustfall, with an emphasis on shape-dependent characteristics and risks. Dustfall samples from urban residences were analyzed using density separation, microscopy, and micro-Fourier-transform infrared spectroscopy (μ-FTIR). Our findings showed that the dustfall MPs consisted of fragmented, fibrous, and spherical shapes, with fragmented MPs accounting for 31 % of the total. Due to their larger specific surface area (SSA), fragmented MPs exhibited a higher absorption capacity. A health risk model for human intestinal absorption of MPs in indoor dustfall was developed, revealing that fragmented MPs contributed the highest absorption rate (0.0289), followed by spherical MPs (0.0136) and fibers (0.0088). Indoor surveys further indicated that practices such as choosing low-emission wall materials, increasing ventilation, and using air purifiers can reduce indoor MP levels. Our results underscore the importance of targeting fragmented MPs in risk assessments and mitigation strategies.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"362 ","pages":"Article 121586"},"PeriodicalIF":3.7,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145263221","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 impact of carbonaceous and inorganic aerosols on haze dynamics: Insights from size-resolved analysis","authors":"Yen Thi-Hoang Le ,&nbsp;Hanjin Yoo ,&nbsp;Haeju Lee ,&nbsp;Seeun Park ,&nbsp;Ki-Joon Jeon","doi":"10.1016/j.atmosenv.2025.121590","DOIUrl":"10.1016/j.atmosenv.2025.121590","url":null,"abstract":"<div><div>Understanding size-resolved physicochemical characteristics of atmospheric aerosols is pivotal for elucidating their formation mechanisms, behavior, and atmospheric fate. However, most aerosol studies rely on mass-based methods, which often underestimate the contribution of ultrafine and submicron particles due to their low mass fractions. Despite their small mass, these particles dominate the aerosol number concentrations and play a critical role in atmospheric chemical processes. Herein, we investigate the size-resolved characteristics of submicron aerosols, focusing on three major components: carbon, nitrate, and sulfate, using an integrated analytical approach that combines particle size distribution (PSD) and chemical composition analytical analysis. Online PSD measurements and offline size-segregated aerosol sampling were simultaneously performed using an electrical low-pressure impactor (ELPI+), covering aerodynamic diameters from 6 nm to 1.64 μm. Raman spectroscopy was applied to investigate the chemical composition of size-resolved samples. This integrated approach was applied during a winter haze event. Our results indicate that ultrafine carbonaceous particles, primarily from local traffic emissions, dominated the concentration of submicron aerosols. In contrast, secondary inorganic aerosols (sulfate and nitrate) were prominent in the accumulation mode, forming heterogeneously on pre-existing particles’ surfaces. Nitrate concentrations were particularly elevated during daytime haze periods and coexisted with highly oxidized carbonaceous particles. The observed evolution in carbonaceous aerosol oxidation states and mixing characteristics contributed to enhanced atmospheric reactions, light absorption and scattering modification, and reduced visibility, which are key drivers of haze formation. These findings demonstrate the effectiveness of the integrated analytical approach for advancing our understanding of submicron aerosol behavior and their role in air pollution and climate.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"362 ","pages":"Article 121590"},"PeriodicalIF":3.7,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145263224","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":"Formation and kinetics of terpenoic acids from α-pinene and δ-3-carene-derived SOA components via aqueous-phase OH radicals","authors":"Katarzyna Pawlak ,&nbsp;Agata Błaziak ,&nbsp;Bartłomiej Witkowski ,&nbsp;Tomasz Gierczak ,&nbsp;Rafał Szmigielski","doi":"10.1016/j.atmosenv.2025.121587","DOIUrl":"10.1016/j.atmosenv.2025.121587","url":null,"abstract":"<div><div>Bimolecular reaction rate coefficients (k_OH, L mol⁻¹s⁻¹) for the aqueous oxidation of pinic, caric, caronic, norpinic, and norpinonic acids by OH radicals were measured within the presented study. Furthermore, a quantitative analysis was performed for selected products formed in the studied OH reactions, including those known in the literature, SOA components of α-pinene and δ-3-carene. Values of k_OH were measured for the neutral (pH = 2) and deprotonated (pH = 10) forms of the terpenoic acids under investigation in the temperature range between 288 and 308 K. The reactions of caronic and caric acids with OH radicals appear slightly faster (k_OH^{298K pH2} = 3.3 ± 0.1 × 10⁹ L mol⁻¹s⁻¹ and k_OH^{298K pH2} = 3.3 ± 0.1 × 10⁹ L mol⁻¹s⁻¹, respectively) than those of norpinic (k_OH^{298K pH2} = 1.2 ± 0.1 × 10⁹ L mol⁻¹s⁻¹), norpinonic (k_OH^{298K pH2} = 1.1 ± 0.1 × 10⁹ L mol⁻¹s⁻¹) and pinic acids (k_OH^{298K pH2} = 2.1 ± 0.1 × 10⁹ L mol⁻¹s⁻¹). The calculated activation energies (E) fall in a 9–21 kJ mol⁻¹ range, explaining the very weak temperature dependence of the measured reaction rates. The calculated lifetimes decreased with increasing LWC (from 10⁻¹² m³ m³ in aerosol to 10⁻⁵ m³ m⁻³ in storms), indicating that the acids undergo significant aqueous processing under realistic atmospheric conditions. The analysis of extremely low-volatility products allowed proposing reaction paths from earlier– to later–generation products (only carboxylic acid) of α-pinene. We measured that terebic acid can be formed through the aqueous phase OH reaction of norpinic acid, but also through terpenylic acid oxidation. Moreover, we found that the reaction of terpenylic acid + OH radicals is almost 10 times slower than the oxidation of pinic and pinonic acids. Therefore, observed in the atmosphere, terebic acid formation is mainly through direct oxidation of an early-generation oxidation product of α-pinene (pinic and pinonic acids) rather than from the secondary reaction of terpenylic acid.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"362 ","pages":"Article 121587"},"PeriodicalIF":3.7,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145226867","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":"PTR-QMS observation of OVOCs in an urban suburb of Guangzhou: seasonal characterization, source apportionment and regional transport","authors":"Xiaoyao Ma ,&nbsp;Guanyong Liu ,&nbsp;Jiangyao Chen","doi":"10.1016/j.atmosenv.2025.121589","DOIUrl":"10.1016/j.atmosenv.2025.121589","url":null,"abstract":"<div><div>Understanding pollution, source and effect of oxygenated volatile organic compounds (OVOCs) is crucial for improving air quality in urban suburbs. This study utilized a proton-transfer-reaction quadrupole mass spectrometer to investigate OVOC pollution characteristics and environmental impacts across four seasons (2022–2023) in an urban suburb of Guangzhou. Results showed that OVOCs dominated total VOCs (averaging 75.4 %), with methanol, acetone, formaldehyde, and carboxylic acids as predominant species. These compounds significantly contributed to ozone formation potential (40.6 %–60.3 %) and OH reactivity. OVOC concentrations exhibited a distinct seasonal pattern (spring &gt; autumn &gt; winter &gt; summer), influenced by photochemical processes and regional transport. Diurnal variations indicated that methanol peaked in the morning and evening linked to primary emissions, while aldehydes and ketones peaked in the afternoon due to secondary formation. Carboxylic acids displayed complex multi-peak patterns with significant nighttime accumulation, correlating with PM_2.5 and suggesting a key role in secondary organic aerosol formation. Photochemical age-based source apportionment revealed diverse contributions: primary emissions were crucial for methanol, methyl ethyl ketone, and acetic acid; secondary formation was important for acetaldehyde, methyl ethyl ketone, and acetic acid; biogenic emissions contributed to formic acid, acetaldehyde, acrolein, and acetone; and background sources impacted methanol in colder seasons. Trajectory clustering and potential source contribution function analyses identified seasonally modulated transport patterns influencing the source areas of OVOCs, PM_2.5 and O₃. The study highlights OVOCs as key drivers of O₃ and SOA formation in urban suburb, while effective mitigation of photochemical pollution in such area requires a multi-faceted control strategy that not only targets local primary precursors (e.g., from traffic and solvents) but also incorporates regionally coordinated efforts to address seasonally varying transboundary pollution.</div></div>","PeriodicalId":250,"journal":{"name":"Atmospheric Environment","volume":"362 ","pages":"Article 121589"},"PeriodicalIF":3.7,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145226864","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}