From outdoor to indoor air pollution source apportionment: Answers to ten challenging questions

TrAC Trends in Analytical Chemistry, Год журнала: 2024, Номер 178, С. 117821 - 117821

Опубликована: Июнь 19, 2024

Язык: Английский

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Review of source analyses of ambient volatile organic compounds considering reactive losses: methods of reducing loss effects, impacts of losses, and sources

Atmospheric chemistry and physics, Год журнала: 2024, Номер 24(22), С. 12861 - 12879

Опубликована: Ноя. 20, 2024

Abstract. Chemical losses of ambient reactive volatile organic compounds (VOCs) is a long-term issue yet to be resolved in VOC source apportionments. These substantially reduce the concentrations highly species apportioned factor profiles and result underestimation contributions. This review assesses common methods existing issues ways loss impacts analyses suggests research directions for improved Positive matrix factorization (PMF) now main analysis method compared other mathematical models. The using any apportionment tool processing data analyzed losses. Estimating initial VOCs based on photochemical age has become primary approach effects PMF, except selecting low-reactivity or nighttime into analysis. Currently, concentration only considers daytime reactions with hydroxyl (⚫OH) radicals. However, ⚫OH rate constants vary temperature, that not been considered. Losses from O3 NO3 radicals, especially alkene species, remain included. Thus, accuracy estimation uncertain. Beyond developing accurate quantitative approaches losses, consumed quantification different contributions secondary aerosols are important additional future research.

Язык: Английский

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Annual variations in characteristics and sources analysis of VOCs during the ozone season in the Taiyuan Basin, China, from 2020 to 2022

Air Quality Atmosphere & Health, Год журнала: 2024, Номер unknown

Опубликована: Июнь 13, 2024

Язык: Английский

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Exploring the variations in ambient BTEX in urban Europe and its environmental health implications

Опубликована: Июль 31, 2024

Abstract. BTEX (benzene, toluene, ethylbenzene, m,p,o-xylene) are significant urban air pollutants. This study examines variability across seven European countries using data from 22 monitoring sites in different settings (urban background, traffic, industry, and suburban background). Results indicate that the relative abundance of areas follows order: toluene > benzene m,p-xylene o-xylene with mean mixing ratios 391 ± 451, 252 324, 222 297, 92 119, 78 107 ppt 2017 to 2022, respectively. Seasonal trends show had similar median concentrations industrial sites, indicating mixed sources. Toluene levels were highest traffic areas, highlighting road emissions. Ethylbenzene xylenes showed equivalent but lower backgrounds. Peak occurred during morning evening rush hours, linked 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 (LCR) values for exposure below definite risk threshold (10−4) above permissible level (10−6), suggesting moderate particularly areas. offers essential insights into environments.

Язык: Английский

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Quantification and source apportionment of atmospheric oxidation capacity in urban atmosphere by considering reactive chlorine species and photochemical loss of VOCs

The Science of The Total Environment, Год журнала: 2024, Номер 959, С. 178201 - 178201

Опубликована: Дек. 22, 2024

Язык: Английский

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