Measurement report: Exploring the variations in ambient BTEX in urban Europe and their environmental health implications

Atmospheric chemistry and physics, Год журнала: 2025, Номер 25(1), С. 625 - 638

Опубликована: Янв. 17, 2025

Abstract. BTEX (benzene, toluene, ethylbenzene, and m-xylene,p-xylene, o-xylene) are significant urban air pollutants. This study examines variability across 7 European countries using data from 22 monitoring sites in different settings (urban background, traffic, industry, suburban background). Results indicate that the relative abundance of areas follows order toluene > benzene m,p-xylene o-xylene with median mixing ratios 266 ± 152, 163 74, 129 88, 53 35, 45 27 ppt during years 2017–2022, respectively. Seasonal trends show had similar concentrations industrial sites, indicating mixed sources. Toluene levels were highest traffic areas, highlighting road emissions. Ethylbenzene xylenes showed equivalent but lower backgrounds. Peak occurred morning evening rush hours, linked to heating, atmospheric stagnation. B/T ranged 0.29 0.11 1.35 0.95, X/E 1.75 0.91 3.68 0.30, primary pollution local followed by solvents, coatings, biomass burning. Lifetime cancer risk exposure was below definite threshold (10−4) above permissible level (10−6), suggesting moderate particularly areas. Additionally, health index at generally than limit value, a low non-carcinogenic overall. offers essential insights into environments.

Язык: Английский

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Sources-oriented contributions to ozone and secondary organic aerosol formation potential based on initial VOCs in an urban area of Eastern Asia

The Science of The Total Environment, Год журнала: 2023, Номер 892, С. 164392 - 164392

Опубликована: Май 25, 2023

Язык: Английский

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Changes in source apportioned VOCs during high O3 periods using initial VOC-concentration-dispersion normalized PMF

The Science of The Total Environment, Год журнала: 2023, Номер 896, С. 165182 - 165182

Опубликована: Июнь 28, 2023

Язык: Английский

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Source apportionment of consumed volatile organic compounds in the atmosphere

Journal of Hazardous Materials, Год журнала: 2023, Номер 459, С. 132138 - 132138

Опубликована: Июль 24, 2023

Язык: Английский

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Characteristic, source apportionment and effect of photochemical loss of ambient VOCs in an emerging megacity of Central China

Atmospheric Research, Год журнала: 2024, Номер 305, С. 107429 - 107429

Опубликована: Апрель 21, 2024

Язык: Английский

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The application of positive matrix factorization with diagnostics to BIG DATA

Chemometrics and Intelligent Laboratory Systems, Год журнала: 2023, Номер 240, С. 104885 - 104885

Опубликована: Июнь 21, 2023

Over the past decade, Positive Matrix Factorization (PMF) has become most commonly used tool for source apportionment of air pollutants with a large fraction those studies using implementation developed by U.S. Environmental Protection Agency (EPA-PMF) and its very useful diagnostic tools. During same period, more are utilizing monitoring tools that provide hourly or even higher time resolution data leading to sets (millions points). Because nature graphic user interface in EPA-PMF, it cannot handle than approximately half million points. Thus, alternative approaches needed permit these larger be analyzed still able outputs better interpretations results. We have protocol use multilinear engine (ME-2) is solver EPA-PMF make such analyses. Here we report how this approach present results representative set particle size distributions obtained Rochester, New York between 2008 2019.

Язык: Английский

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Characterization of photochemical losses of volatile organic compounds and their implications for ozone formation potential and source apportionment during summer in suburban Jinan, China

Environmental Research, Год журнала: 2023, Номер 238, С. 117158 - 117158

Опубликована: Сен. 17, 2023

Язык: Английский

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Revealing the Influencing Factors of an Oxygenated Volatile Organic Compounds (OVOCs) Source Apportionment Model: A Case Study of a Dense Urban Agglomeration in the Winter

Journal of Geophysical Research Atmospheres, Год журнала: 2024, Номер 129(4)

Опубликована: Фев. 21, 2024

Abstract Understanding sources of oxygenated volatile organic compounds (OVOCs) in the atmosphere still has large uncertainties. In this study, an improved OVOC source apportionment model was developed by principal component analysis and multiple linear regression based on online monitoring nonmethane hydrocarbons (NMHCs) OVOCs a dense urban agglomeration winter. The modeled concentrations were good agreement with measured ( R 2 = 0.56–0.97). major OVOCs, except for 2‐methylacrolein, greatly affected anthropogenic (15.8%–76.8%) secondary generation (0.0%–51.7%), while transport natural contributed to 0.0%–26.8% 0.0%–32.0%, respectively. selection isoprene as tracer led underestimation species from primary emission overestimation sources. addition, photochemical reactions significantly reduced simulation accuracy NMHCs afternoon, 0.60 ± 0.23, which lower than overall value 0.82 0.11. However, (0.83 0.14) did not decrease afternoon due compensation oxidation. Furthermore, concentration gradient distribution gradually changes normal exponential concentration, influenced degree matching between change. Developing models additional tracers at different levels may enhance robustness without increasing its complexity.

Язык: Английский

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Photochemical oxidation of VOCs and their source impact assessment on ozone under de-weather conditions in Western Taiwan

Environmental Pollution, Год журнала: 2024, Номер 346, С. 123662 - 123662

Опубликована: Фев. 26, 2024

Язык: Английский

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Effects of gas phase composition on competitive adsorption properties of formaldehyde on titanium dioxide-supported platinum in single and mixture compositions

The Science of The Total Environment, Год журнала: 2023, Номер 892, С. 163924 - 163924

Опубликована: Июнь 1, 2023

Язык: Английский

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