Aerosol liquid water in PM2.5 and its roles in secondary aerosol formation at a regional site of Yangtze River Delta DOI

Ruifang Shi,

Zhang Fei,

Yemin Shen

et al.

Journal of Environmental Sciences, Journal Year: 2023, Volume and Issue: 138, P. 684 - 696

Published: May 4, 2023

Language: Английский

A review of secondary organic aerosols formation focusing on organosulfates and organic nitrates DOI

Wulve Fan,

Ting Chen, Zhiliang Zhu

et al.

Journal of Hazardous Materials, Journal Year: 2022, Volume and Issue: 430, P. 128406 - 128406

Published: Feb. 2, 2022

Language: Английский

Citations

54

Multiple relationships between aerosol and COVID-19: A framework for global studies DOI Open Access
Yaxin Cao, Longyi Shao, Timothy Peter Jones

et al.

Gondwana Research, Journal Year: 2021, Volume and Issue: 93, P. 243 - 251

Published: Feb. 10, 2021

Language: Английский

Citations

47

Slower than expected reduction in annual PM2.5 in Xi'an revealed by machine learning-based meteorological normalization DOI
Meng Wang, Zhuozhi Zhang, Qi Yuan

et al.

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 841, P. 156740 - 156740

Published: June 16, 2022

Language: Английский

Citations

32

Polycyclic aromatic hydrocarbons from cooking emissions DOI
Chunshui Lin, Ru‐Jin Huang,

Jing Duan

et al.

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 818, P. 151700 - 151700

Published: Nov. 16, 2021

Language: Английский

Citations

41

Chemical characteristics and sources of organosulfates, organosulfonates, and carboxylic acids in aerosols in urban Xi'an, Northwest China DOI Creative Commons
Marianne Glasius, Ditte Thomsen, Kai Wang

et al.

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 810, P. 151187 - 151187

Published: Oct. 29, 2021

We investigated speciation and levels of organosulfates, organosulfonates as well carboxylic acids in aerosol samples collected during summer (2014) winter (2014/15) Xi'an, Northwest China, to improve understanding composition sources organic aerosols this region heavily affected by air pollution. Organosulfates are formed from reactive gas-phase compounds acidic sulfate aerosols, contributing secondary SOA. The show a large diversity organosulfur species line with other regions reflecting the high complexity SOA precursors. In samples, organosulfates isoprene prevalent due transport masses southern isoprene-emitting mountain forests. During winter, local or areas north city low population density very temperatures. estimated (768 ± 346 ng m-3) (938 374 more similar than expected given carbon indicating formation processes. observed an organosulfonate molecular weight 214 (C6H14O6S) at (254 232 but much lower concentrations (12 13 summer. High were mainly pH below about 2.5. Concentrations oxidation monoterpenes (5.2 2.7 m-3 summer). Phthalic acid was 90 29 correlated highly carbon, chloride potassium, common origin, most likely burning biomass plastic-containing waste. Further research is needed elucidate organosulfonates, impact on properties affecting e.g. health effects.

Language: Английский

Citations

35

Measurement report: Large contribution of biomass burning and aqueous-phase processes to the wintertime secondary organic aerosol formation in Xi'an, Northwest China DOI Creative Commons

Jing Duan,

Ru‐Jin Huang,

Yifang Gu

et al.

Atmospheric chemistry and physics, Journal Year: 2022, Volume and Issue: 22(15), P. 10139 - 10153

Published: Aug. 9, 2022

Abstract. Secondary organic aerosol (SOA) plays an important role in particulate air pollution, but its formation mechanism is still not fully understood. The chemical composition of non-refractory matter with a diameter ≤2.5 µm (NR-PM2.5), OA sources, and SOA mechanisms were investigated urban Xi'an during winter 2018. fractional contribution to total mass (58 %) was larger than primary (POA, 42 %). Biomass-burning-influenced oxygenated (OOA-BB) resolved formed from the photochemical oxidation aging biomass burning (BBOA). OOA-BB more favorable on days fraction higher BBOA concentration. In comparison, aqueous-phase processed (aq-OOA) dependent secondary inorganic (SIA) content liquid water (ALWC), it showed large increase (to 50 % OA) SIA-enhanced periods. Further van Krevelen (VK) diagram analysis suggests that addition carboxylic acid groups fragmentation dominated reference days, while increased aq-OOA contributions periods likely reflect evolution due alcohol or peroxide groups.

Language: Английский

Citations

27

Measurement report: Intensive biomass burning emissions and rapid nitrate formation drive severe haze formation in the Sichuan Basin, China – insights from aerosol mass spectrometry DOI Creative Commons

Zhier Bao,

Xinyi Zhang, Qing Li

et al.

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(2), P. 1147 - 1167

Published: Jan. 23, 2023

Abstract. Haze pollution is a severe environmental problem, caused by elevation of fine particles (aerodynamic diameter <2.5 µm, PM2.5), which related to secondary aerosol formation, unfavourable synoptic conditions and regional transport, etc. The haze formation in basin areas, along with intensive emission precursors, high relative humidity poor dispersion conditions, still limitedly understood. In this study, field campaign was conducted investigate the factors resulting Sichuan Basin (SCB) during winter 2021. chemical composition characterised using time-of-flight speciation monitor (ToF-ACSM), also provided detailed information on sources for organic aerosols (OAs). average concentration non-refractory (NR-PM2.5) 98.5±38.7 µg m−3, organics aerosols, nitrate, sulfate, ammonium chloride took up 40.3 %, 28.8 10.6 15.3 % 5.1 PM2.5. Three factors, including hydrocarbon-like OA (HOA), biomass burning (BBOA) an oxygenated (OOA), were identified applying positive matrix factorisation (PMF) analysis, they constituted 24.2 51.6 average, respectively. Nitrate promoted gas-phase aqueous-phase oxidation, while sulfate mainly formed through process. OOA showed strong dependence Ox, demonstrating contribution photooxidation formation. increased as liquid water content (ALWC) within 200 m−3 kept relatively constant when ALWC >200 suggesting insignificant effect reactions Among three episodes whole campaign, driving different: first episode (H1) driven nitrate photochemical reactions, second (H2) intense primary from vehicle exhaust, third (H3) involving emission. HOA BBOA scavenged, OOA, enhanced fog periods, resulted increase O:C pre-fog post-fog periods. This study revealed SCB implied benefit controlling well exhaust mitigation heavy region.

Language: Английский

Citations

14

Multiple pathways for the formation of secondary organic aerosol in the North China Plain in summer DOI Creative Commons

Yifang Gu,

Ru‐Jin Huang,

Jing Duan

et al.

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(9), P. 5419 - 5433

Published: May 16, 2023

Abstract. Secondary organic aerosol (SOA) has been identified as a major contributor to fine particulate matter (PM2.5) in the North China Plain (NCP). However, chemical mechanisms involved are still unclear due incomplete understanding of its multiple formation processes. Here we report field observations summer Handan NCP, based on high-resolution online measurements. Our results reveal SOA via photochemistry and two types aqueous-phase chemistry, latter which include nocturnal daytime processing. The photochemical pathway is most important under high-Ox (i.e., O3 + NO2) conditions (65.1 ± 20.4 ppb). efficient from (Ox-initiated SOA) dominated (65 % OA), with an average growth rate 0.8 µgm-3h-1. During high-relative-humidity (RH; 83.7 12.5 %) period, strong (aqSOA) played significant role production (45 nighttime 0.6 Meanwhile, equally fast µgm-3h-1 Ox-initiated was also observed, contributed 39 OA, showing that aqueous phase non-negligible summer. primary-related (SOA attributed primary organics) aqSOA related residential coal combustion activities, supported by distinct fragments polycyclic aromatic hydrocarbons (PAHs). Moreover, conversion rapid oxidation were possible high-RH conditions. This work sheds light pathways ambient air complex pollution improves our aging high capacity.

Language: Английский

Citations

11

In Situ Observation of Multiphase Oxidation-Driven Secondary Organic Aerosol Formation during Cloud Processing at a Mountain Site in Southern China DOI
Min Gao, Shengzhen Zhou,

Yao He

et al.

Environmental Science & Technology Letters, Journal Year: 2023, Volume and Issue: 10(7), P. 573 - 581

Published: June 13, 2023

Secondary organic aerosols (SOAs) account for a large fraction of atmospheric fine particles, but the mechanisms their formation and evolution processes remain unclear. In this study, ground-based counterflow virtual impactor was used in combination with an online time-of-flight aerosol chemical speciation monitor to investigate multiphase (gaseous aqueous) oxidation SOA influencing factors during cloud events at mountain site southern China. Our results showed that clouds promoted low-oxidized oxygenated (LO-OOA) more-oxidized (MO-OOA). At night, ozone (O3) nitrate radicals (NO3•) oxidized volatile compounds (VOCs, mostly biogenic VOCs) precursors LO-OOA were absorbed droplets form LO-OOA, while hydroxyl radical (•OH) main oxidant daytime. droplets, further by •OH MO-OOA. We propose isoprene can be products gas phase then acidic 2-methylglyceric acid (2-MG), 2-MG-organosulfate, 2-MG-organonitrate. This study improves our understanding formation, driven events.

Language: Английский

Citations

11

Exploring efficient strategies for air quality improvement in China based on its regional characteristics and interannual evolution of PM2.5 pollution DOI

Xin-ze Geng,

Jia-tian Hu,

Zi-meng Zhang

et al.

Environmental Research, Journal Year: 2024, Volume and Issue: 252, P. 119009 - 119009

Published: April 26, 2024

Language: Английский

Citations

4