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Article ; Online: Disentangling fine particles (PM

Dominutti, Pamela A / Mari, Xavier / Jaffrezo, Jean-Luc / Dinh, Vy Thuy Ngoc / Chifflet, Sandrine / Guigue, Catherine / Guyomarc'h, Lea / Vu, Cam Tu / Darfeuil, Sophie / Ginot, Patrick / Elazzouzi, Rhabira / Mhadhbi, Takoua / Voiron, Céline / Martinot, Pauline / Uzu, Gaëlle

The Science of the total environment

2024 Volume 923, Page(s) 171466

Abstract: A comprehensive chemical characterization of fine particulate matter ( ... ...

Abstract	A comprehensive chemical characterization of fine particulate matter (PM
Language	English
Publishing date	2024-03-05
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	121506-1
ISSN	1879-1026 ; 0048-9697
ISSN (online)	1879-1026
ISSN	0048-9697
DOI	10.1016/j.scitotenv.2024.171466
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Article ; Online: Evaluating major anthropogenic VOC emission sources in densely populated Vietnamese cities.

Dominutti, Pamela A / Hopkins, James R / Shaw, Marvin / Mills, Graham P / Le, Hoang Anh / Huy, Duong Huu / Forster, Grant L / Keita, Sekou / Hien, To Thi / Oram, David E

Environmental pollution (Barking, Essex : 1987)

2022 Volume 318, Page(s) 120927

Abstract: Volatile organic compounds (VOCs) play an important role in urban air pollution, both as primary pollutants and through their contribution to the formation of secondary pollutants, such as tropospheric ozone and secondary organic aerosols. In this study, ...

Abstract	Volatile organic compounds (VOCs) play an important role in urban air pollution, both as primary pollutants and through their contribution to the formation of secondary pollutants, such as tropospheric ozone and secondary organic aerosols. In this study, more than 30 VOC species were continuously monitored in the two most populous cities in Vietnam, namely Ho Chi Minh City (HCMC, September-October 2018 and March 2019) and Hanoi (March 2019). In parallel with ambient VOC sampling, grab sampling was used to target the most prevalent regional-specific emission sources and estimate their emission factors (EFs). Emission ratios (ERs) obtained from ambient sampling were compared between Vietnamese cities and other cities across the globe. No significant differences were observed between HCMC and Hanoi, suggesting the presence of similar sources. Moreover, a good global agreement was obtained in the spatial comparison within a factor of 2, with greater ER for aromatics and pentanes obtained in the Vietnamese cities. The detailed analysis of sources included the evaluation of EF from passenger cars, buses, trucks, motorcycles, 3-wheeled motorcycles, waste burning, and coal-burning emissions. Our comparisons between ambient and near-source concentration profiles show that road transport sources are the main contributors to VOC concentrations in Vietnamese cities. VOC emissions were calculated from measured EF and consumption data available in Hanoi and compared with those estimated by a global emission inventory (EDGAR v4.3.2). The total VOC emissions from the road transport sector estimated by the inventory do not agree with those calculated from our observations which showed higher total emissions by a factor of 3. Furthermore, the inventory misrepresented the VOCs speciation, mainly for isoprene, monoterpenes, aromatics, and oxygenated compounds. Accounting for these differences in regional air quality models would lead to improved predictions of their impacts and help to prioritise pollution reduction strategies in the region.
MeSH term(s)	Humans ; Air Pollutants/analysis ; Cities ; Volatile Organic Compounds/analysis ; Environmental Monitoring ; Southeast Asian People ; Vietnam ; Ozone/analysis ; Environmental Pollutants/analysis ; China ; Vehicle Emissions/analysis
Chemical Substances	Air Pollutants ; Volatile Organic Compounds ; Ozone (66H7ZZK23N) ; Environmental Pollutants ; Vehicle Emissions
Language	English
Publishing date	2022-12-21
Publishing country	England
Document type	Journal Article
ZDB-ID	280652-6
ISSN	1873-6424 ; 0013-9327 ; 0269-7491
ISSN (online)	1873-6424
ISSN	0013-9327 ; 0269-7491
DOI	10.1016/j.envpol.2022.120927
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Article: Comprehensive volatile organic compound measurements and their implications for ground-level ozone formation in the two main urban areas of Vietnam

Hien, To Thi / Huy, Duong Huu / Dominutti, Pamela A. / Thien Chi, Nguyen Doan / Hopkins, James R. / Shaw, Marvin / Forster, Grant / Mills, Graham / Le, Hoang Anh / Oram, David

Atmospheric environment. 2022 Jan. 15, v. 269

2022

Abstract: Volatile organic compounds (VOCs) and oxygenated VOCs (OVOCs) were measured in Ho Chi Minh City (HCMC) and Hanoi, the two largest and most populous cities in Vietnam. The purpose of this study is to better understand the VOC atmospheric composition and ... ...

Abstract	Volatile organic compounds (VOCs) and oxygenated VOCs (OVOCs) were measured in Ho Chi Minh City (HCMC) and Hanoi, the two largest and most populous cities in Vietnam. The purpose of this study is to better understand the VOC atmospheric composition and their role in ground-level ozone formation. Online measurements of a wide range of VOCs and other pollutants were conducted using numerous instruments during different seasons (dry and rainy) in HCMC and Hanoi (spring). Our results show that the mean mixing ratio of total measured VOCs in Hanoi was 80.8 ± 40.7 ppb (mean ± standard deviation), and was similar to that observed during the rainy season (75.2 ± 44.8 ppb) in HCMC. During the dry season campaign in HCMC, which was coincident with the Hanoi campaign, total VOC was around 50% lower (40.7 ± 19.5 ppb), largely a result of increased planetary boundary layer (PBL) height and the direction of the prevailing wind. VOC profiles in both cities were dominated by alkanes (31–35%) and OVOCs (27–33%) and the proportion of alkenes (13–17%) and aromatics (12–19%) were comparable. Similarities in diurnal variation for most VOC species (except for isoprene) are seen in both cities with two clear peaks during the morning (7:00–8:00 a.m.) and evening (18:00 p.m.) rush hours, as observed for vehicular-combustion tracers (acetylene and CO). Comparisons of the ambient ratios of paired VOCs, namely i/n-pentane, and toluene/benzene, with those reported in motorcycle exhaust, roadside and gasoline samples indicate that motorcycle-related emission is likely a major contributor to VOC pollution. According to the propylene-equivalent concentration (PE conc.) and maximum incremental reactivity (MIR) methods, alkenes and aromatics were determined to be the main contributors to reactivity and ozone potential formation. Furthermore, the initial mixing ratio of VOC species was estimated based on the photochemical age method. The consumed VOCs (initial VOCs minus measured VOCs) has a similar variation trend to ground-level ozone, and a good correlation is observed in HCMC. In contrast, this result was not seen in Hanoi despite relatively high levels of PE conc. and MIR.
Keywords	acetylene ; atmospheric chemistry ; benzene ; diurnal variation ; dry season ; environment ; gasoline ; isoprene ; motorcycles ; ozone ; photochemistry ; pollution ; roadsides ; spring ; standard deviation ; toluene ; troposphere ; volatile organic compounds ; wet season ; wind ; Vietnam
Language	English
Dates of publication	2022-0115
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	216368-8
ISSN	0004-6981 ; 1352-2310
ISSN	0004-6981 ; 1352-2310
DOI	10.1016/j.atmosenv.2021.118872
Database	NAL-Catalogue (AGRICOLA)

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Article: Evaluation of the Sources, Precursors, and Processing of Aerosols at a High-Altitude Tropical Site.

Dominutti, Pamela A / Chevassus, Emmanuel / Baray, Jean-Luc / Jaffrezo, Jean-Luc / Borbon, Agnès / Colomb, Aurèlie / Deguillaume, Laurent / El Gdachi, Samira / Houdier, Stephan / Leriche, Maud / Metzger, Jean-Marc / Rocco, Manon / Tulet, Pierre / Sellegri, Karine / Freney, Evelyn

ACS earth & space chemistry

2022 Volume 6, Issue 10, Page(s) 2412–2431

Abstract: This work presents the results from a set of aerosol- and gas-phase measurements collected during the BIO-MAÏDO field campaign in Réunion between March 8 and April 5, 2019. Several offline and online sampling devices were installed at the Maïdo ... ...

Abstract	This work presents the results from a set of aerosol- and gas-phase measurements collected during the BIO-MAÏDO field campaign in Réunion between March 8 and April 5, 2019. Several offline and online sampling devices were installed at the Maïdo Observatory (MO), a remote high-altitude site in the Southern Hemisphere, allowing the physical and chemical characterization of atmospheric aerosols and gases. The evaluation of short-lived gas-phase measurements allows us to conclude that air masses sampled during this period contained little or no anthropogenic influence. The dominance of sulfate and organic species in the submicron fraction of the aerosol is similar to that measured at other coastal sites. Carboxylic acids on PM
Language	English
Publishing date	2022-09-12
Publishing country	United States
Document type	Journal Article
ISSN	2472-3452
ISSN	2472-3452
DOI	10.1021/acsearthspacechem.2c00149
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Article: One-year of NMHCs hourly observations in São Paulo megacity: meteorological and traffic emissions effects in a large ethanol burning context

Dominutti, Pamela A / Adalgiza Fornaro / Agnès Borbon / Maria de Fatima Andrade / Thiago Nogueira

Atmospheric environment. 2016 Oct., v. 142

2016

Abstract: São Paulo Megacity (MASP), with more than 20 million inhabitants, is among the world's most populous cities. Brazil is the only area in the world where fuel with a high ethanol content has been used since 1975 and its usage have increased in the last ... ...

Abstract	São Paulo Megacity (MASP), with more than 20 million inhabitants, is among the world's most populous cities. Brazil is the only area in the world where fuel with a high ethanol content has been used since 1975 and its usage have increased in the last decade with the development of flex-fuel vehicles. Here, the biofuel effect on VOCs burden and composition it is discussed by a crossed analysis of long-term ambient data and emission data over the last decades in MASP. The most abundant NMHCs in ppbv were propane (5.02 ± 5.94), ethylene (3.97 ± 4.55), ethane (2.28 ± 1.89), acetylene (1.98 ± 2.11), 2,2,4-trymethylpentane (2.05 ± 1.48), i-propylbenzene (1.96 ± 1.85), n-butane (1.97 ± 2.24), toluene (1.62 ± 2.02), i-pentane (1.30 ± 1.61) and propylene (1.26 ± 1.54). The comparison with studies performed in MASP over the last 15 years showed a decrease in the NMHC concentration levels, in spite of the growth of the vehicular fleet and fuel consumption. Nevertheless, NMHCs mean concentrations were higher in MASP compared to those in other megacities worldwide (Beijing, London, Los Angeles and Paris) by a factor of 1.1 to 10, although showing similar composition. This suggests that NMHC distribution is dominated by traffic emissions regardless of regional characteristics like fuel usage and composition. Diurnal profiles of NMHC in MASP confirm these findings by all showing the same patterns as CO and acetylene, both recognized as combustion emission tracers. Finally large-scale ethanol usage would not affect the distribution of NMHCs in MASP and gasoline vehicular emissions seem to be the most important source of hydrocarbons in urban areas.
Keywords	atmospheric chemistry ; biofuels ; burning ; butanes ; cities ; combustion ; emissions ; energy use and consumption ; ethane ; ethanol ; ethylene ; gasoline ; propane ; propylene ; toluene ; tracer techniques ; traffic ; urban areas ; volatile organic compounds ; Brazil ; China
Language	English
Dates of publication	2016-10
Size	p. 371-382.
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	216368-8
ISSN	0004-6981 ; 1352-2310
ISSN	0004-6981 ; 1352-2310
DOI	10.1016/j.atmosenv.2016.08.008
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Local incomplete combustion emissions define the PM

Bhattu, Deepika / Tripathi, Sachchida Nand / Bhowmik, Himadri Sekhar / Moschos, Vaios / Lee, Chuan Ping / Rauber, Martin / Salazar, Gary / Abbaszade, Gülcin / Cui, Tianqu / Slowik, Jay G / Vats, Pawan / Mishra, Suneeti / Lalchandani, Vipul / Satish, Rangu / Rai, Pragati / Casotto, Roberto / Tobler, Anna / Kumar, Varun / Hao, Yufang /

Qi, Lu / Khare, Peeyush / Manousakas, Manousos Ioannis / Wang, Qiyuan / Han, Yuemei / Tian, Jie / Darfeuil, Sophie / Minguillon, Mari Cruz / Hueglin, Christoph / Conil, Sébastien / Rastogi, Neeraj / Srivastava, Atul Kumar / Ganguly, Dilip / Bjelic, Sasa / Canonaco, Francesco / Schnelle-Kreis, Jürgen / Dominutti, Pamela A / Jaffrezo, Jean-Luc / Szidat, Sönke / Chen, Yang / Cao, Junji / Baltensperger, Urs / Uzu, Gaëlle / Daellenbach, Kaspar R / El Haddad, Imad / Prévôt, André S H

Nature communications

2024 Volume 15, Issue 1, Page(s) 3517

Abstract: The oxidative potential (OP) of particulate matter (PM) is a major driver of PM-associated health effects. In India, the emission sources defining PM-OP, and their local/regional nature, are yet to be established. Here, to address this gap we determine ... ...

Abstract	The oxidative potential (OP) of particulate matter (PM) is a major driver of PM-associated health effects. In India, the emission sources defining PM-OP, and their local/regional nature, are yet to be established. Here, to address this gap we determine the geographical origin, sources of PM, and its OP at five Indo-Gangetic Plain sites inside and outside Delhi. Our findings reveal that although uniformly high PM concentrations are recorded across the entire region, local emission sources and formation processes dominate PM pollution. Specifically, ammonium chloride, and organic aerosols (OA) from traffic exhaust, residential heating, and oxidation of unsaturated vapors from fossil fuels are the dominant PM sources inside Delhi. Ammonium sulfate and nitrate, and secondary OA from biomass burning vapors, are produced outside Delhi. Nevertheless, PM-OP is overwhelmingly driven by OA from incomplete combustion of biomass and fossil fuels, including traffic. These findings suggest that addressing local inefficient combustion processes can effectively mitigate PM health exposure in northern India.
Language	English
Publishing date	2024-04-25
Publishing country	England
Document type	Journal Article
ZDB-ID	2553671-0
ISSN	2041-1723 ; 2041-1723
ISSN (online)	2041-1723
ISSN	2041-1723
DOI	10.1038/s41467-024-47785-5
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Book ; Online: Insights into tropical cloud chemistry at Reunion Island (Indian Ocean)

eISSN: 1680-7324

results from the BIO-MAÏDO campaign

2021

Abstract: We present here the results obtained during an intensive field campaign conducted in the framework of the French “BIO-MAÏDO” (Bio-physico-chemistry of tropical clouds at Maïdo (Réunion Island): processes and impacts on secondary organic aerosols’ ... ...

Abstract	We present here the results obtained during an intensive field campaign conducted in the framework of the French “BIO-MAÏDO” (Bio-physico-chemistry of tropical clouds at Maïdo (Réunion Island): processes and impacts on secondary organic aerosols’ formation) project. This study integrates an exhaustive chemical and microphysical characterization of cloud water obtained in March–April 2019 at Reunion Island (Indian Ocean). Fourteen cloud samples have been collected along the slope of this mountainous island. A comprehensive chemical characterization of these samples is performed, including inorganic ions, metals, oxidants, and organic matter (organic acids, sugars, amino acids, carbonyls, and low-soluble volatile organic compounds (VOCs)). Cloud water presents high molecular complexity with elevated water-soluble organic matter content partly modulated by microphysical cloud properties. As expected, our findings show the presence of compounds of marine origin in cloud water samples ( e.g. , chloride, sodium) demonstrating ocean–cloud exchanges. However, the non-sea salt fraction of sulphate varies between 38 and 91 %, indicating the presence of other sources. Also, the presence of amino acids and for the first time in cloud waters of sugars, clearly indicates that biological activities contribute to the cloud water chemical composition. A significant variability between events is observed in the dissolved organic content (25.5 ± 18.4 mgC L −1 ), with levels reaching up to 62 mgC L −1 . This variability was not similar for all the measured compounds, suggesting the presence of dissimilar emission sources or production mechanisms. For that, a statistical analysis is performed based on back-trajectory calculations using the CAT (Computing Atmospheric Trajectory Tool) model associated with land cover registry. These investigations reveal that air mass origins and microphysical variables do not fully explain the variability observed in cloud chemical composition, highlighting the complexity of emission sources, multiphasic transfer, and chemical processing in clouds. Additionally, several VOCs (oxygenated and low-soluble VOCs) were analysed in both gas and aqueous phases. Significant levels of biogenic low-soluble VOCs were detected in the aqueous phase, indicating the cloud-terrestrial vegetation exchange. Cloud scavenging of VOCs is assessed and compared to Henry’s law equilibrium to evaluate potential super or sub saturation conditions. The evaluation reveals the supersaturation of low-soluble VOCs from both natural and anthropogenic sources. Our results depict even higher supersaturation of terpenoids, suggesting their importance in the aqueous phase chemistry in highly impacted tropical areas.
Subject code	550 ; 551
Language	English
Publishing date	2021-07-27
Publishing country	de
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Disentangling fine particles (PM

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Article ; Online: Evaluating major anthropogenic VOC emission sources in densely populated Vietnamese cities.

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Article: Comprehensive volatile organic compound measurements and their implications for ground-level ozone formation in the two main urban areas of Vietnam

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Article: Evaluation of the Sources, Precursors, and Processing of Aerosols at a High-Altitude Tropical Site.

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Article: One-year of NMHCs hourly observations in São Paulo megacity: meteorological and traffic emissions effects in a large ethanol burning context

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Article ; Online: Local incomplete combustion emissions define the PM

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Book ; Online: Insights into tropical cloud chemistry at Reunion Island (Indian Ocean)

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