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

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 906, P. 167847 - 167847

Published: Oct. 14, 2023

Language: 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, Journal Year: 2024, Volume and Issue: 24(1), P. 219 - 233

Published: Jan. 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.

Language: 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, Journal Year: 2023, Volume and Issue: 870, P. 161868 - 161868

Published: Jan. 31, 2023

Language: 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, Journal Year: 2023, Volume and Issue: 903, P. 166182 - 166182

Published: Aug. 9, 2023

Language: 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, Journal Year: 2024, Volume and Issue: 151, P. 627 - 639

Published: April 27, 2024

Language: 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, Journal Year: 2022, Volume and Issue: 326, P. 116703 - 116703

Published: Nov. 16, 2022

Language: Английский

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

Journal of Environmental Management, Journal Year: 2023, Volume and Issue: 338, P. 117778 - 117778

Published: April 3, 2023

Language: 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, Journal Year: 2023, Volume and Issue: 23(8), P. 220429 - 220429

Published: Jan. 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.

Language: Английский

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

Atmospheric Environment, Journal Year: 2022, Volume and Issue: 277, P. 119077 - 119077

Published: March 21, 2022

Language: Английский

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Enhanced catalytic activity of toluene oxidation over in-situ prepared Mn3O4-Fe2O3 with acid-etching treatment

Catalysis Communications, Journal Year: 2022, Volume and Issue: 174, P. 106581 - 106581

Published: Dec. 9, 2022

Mn3O4-Fe2O3 composite catalysts are in-situ synthesized via advanced oxidation followed by modifying with hydrochloric acid to improve the catalytic toluene performance. modified 1.0 M HCl (A-1.0) exhibited best activity of oxidation. The temperature 50% conversion is 245 °C and 90% 279 °C. There much more abundant surface lattice oxygen species higher amount high valence manganese iron ions on A-1.0 catalyst, which beneficial for improving activity. In-situ DRIFTs indicated that benzaldehyde benzoic main intermediate products catalyst during

Language: Английский

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