Drivers and impacts of decreasing concentrations of atmospheric volatile organic compounds (VOCs) in Beijing during 2016–2020

The Science of The Total Environment, Год журнала: 2023, Номер 906, С. 167847 - 167847

Опубликована: Окт. 14, 2023

Язык: Английский

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Current status of model predictions of volatile organic compounds and impacts on surface ozone predictions during summer in China

Atmospheric chemistry and physics, Год журнала: 2024, Номер 24(1), С. 219 - 233

Опубликована: Янв. 10, 2024

Abstract. Volatile organic compounds (VOCs) play a crucial role in the formation of tropospheric ozone (O3) and secondary aerosols. VOC emissions are generally considered to have larger uncertainties compared other pollutants, such as sulfur dioxide fine particulate matter (PM2.5). Although predictions O3 PM2.5 been extensively evaluated air quality modeling studies, there has limited reporting on evaluation VOCs, mainly due lack routine measurements at multiple sites. In this study, we utilized from “Towards an Air Toxic Management System China” (ATMSYC) project 28 sites across China assessed predicted concentrations using Community Multiscale Quality (CMAQ) model with widely used Multi-resolution Emission Inventory for (MEIC). The ratio observed total VOCs was found be 0.74 ± 0.40, underpredictions ranging 2.05 50.61 ppbv (5.77 % 85.40 %) 24 A greater bias industrial cities north southwest, Jinan, Shijiazhuang, Lanzhou, Chengdu, Guiyang. terms different components, alkanes, alkenes, non-naphthalene aromatics (ARO2MN), alkynes, formaldehyde (HCHO) had prediction-to-observation ratios 0.53 0.38, 0.51 0.48, 0.31 0.41 0.47, 1.21 1.61, respectively. Sensitivity experiments were conducted assess impact prediction predictions. While emission adjustments improved performance resulting change 0.86 they also exacerbated overprediction relative base case by 0.62 6.27 This study demonstrates that current setups inventories likely underpredict concentrations, underprediction contributes lower China.

Язык: Английский

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Divergent summertime surface O3 pollution formation mechanisms in two typical Chinese cities in the Beijing-Tianjin-Hebei region and Fenwei Plain

The Science of The Total Environment, Год журнала: 2023, Номер 870, С. 161868 - 161868

Опубликована: Янв. 31, 2023

Язык: Английский

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Contrasting effects of clean air actions on surface ozone concentrations in different regions over Beijing from May to September 2013–2020

The Science of The Total Environment, Год журнала: 2023, Номер 903, С. 166182 - 166182

Опубликована: Авг. 9, 2023

Язык: Английский

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Characteristics, secondary transformation and odor activity evaluation of VOCs emitted from municipal solid waste incineration power plant

Journal of Environmental Management, Год журнала: 2022, Номер 326, С. 116703 - 116703

Опубликована: Ноя. 16, 2022

Язык: Английский

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Contributions of local emissions and regional background to summertime ozone in central China

Journal of Environmental Management, Год журнала: 2023, Номер 338, С. 117778 - 117778

Опубликована: Апрель 3, 2023

Язык: Английский

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Seasonal Characteristics of Volatile Organic Compounds in Seoul, Korea: Major Sources and Contribution to Secondary Organic Aerosol Formation

Aerosol and Air Quality Research, Год журнала: 2023, Номер 23(8), С. 220429 - 220429

Опубликована: Янв. 1, 2023

Volatile organic compounds (VOCs) are major pollutants that cause air pollution and precursors react in the to produce secondary aerosol (SOA). This study attempted elucidate distribution characteristics of VOCs atmosphere Seoul by measuring 34 types real time winter 2020 summer 2021. The objectives this research as follows: (1) understand difference between compositions, (2) identify main sources summer, (3) estimate contribution SOA formation potential Seoul. Total VOC concentrations were found be higher (7.61 ± 4.22 ppb) than (6.35 4.11 ppb). To further specify components a analysis was performed using ratio marker components, an emission source applying positive matrix factorization model (PMF). attributed five factors: solvent usage, vehicle exhaust, industry/burning fossil fuels, petrochemical industry, road (winter)/gasoline-related (summer). estimated potential. results showed toluene primary contributor both summer. In usage containing high proportion ethylbenzene xylenes contributed more twice much compared winter.

Язык: Английский

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The importance of photochemical loss to source analysis and ozone formation potential: Implications from in-situ observations of volatile organic compounds (VOCs) in Guangzhou, China

Atmospheric Environment, Год журнала: 2023, Номер 320, С. 120320 - 120320

Опубликована: Дек. 29, 2023

Язык: Английский

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Changes in factor profiles deriving from photochemical losses of volatile organic compounds: Insight from daytime and nighttime PMF analyses

Journal of Environmental Sciences, Год журнала: 2024, Номер 151, С. 627 - 639

Опубликована: Апрель 27, 2024

Язык: Английский

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Influence of seasonal variability on source characteristics of VOCs at Houston industrial area

Atmospheric Environment, Год журнала: 2022, Номер 277, С. 119077 - 119077

Опубликована: Март 21, 2022

Язык: Английский

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