Comment on egusphere-2024-2119 DOI Creative Commons

Published: Aug. 16, 2024

Abstract. Secondary organic aerosols (SOA) from highly volatile compounds (VOCs) are currently not well represented in numerical models as their heterogeneous formation mechanisms the atmosphere remain unclear. Based on smog chamber experiments, here we investigated yield and pathway of SOA acetone photooxidation presence preexisting haze particles ((NH4)2SO4, NH4HSO4) mineral dusts (Na2SO4) under ammonia-rich conditions. Our results showed that acetone-derived can be remarkably enhanced via multiphase reactions these seeds especially for dusts, suggesting VOCs is an important source atmospheric SOA. We found aerosol acidity a key factor controlling pathways SOA, which carbonyls produced dissolve into aqueous phase oligomerize consist larger molecules acidic but smaller neutral aerosols. Moreover, light absorption ability formed (NH4)2SO4 stronger than Na2SO4 mineral ammonia. yields obtained, estimated importance global atmosphere, 9.5–18.4 Tg yr-1, equivalent to 8.5–16.4 % budget, such should accounted future model studies.

Language: Английский

Molecular insights into the composition, sources, and aging of atmospheric brown carbon DOI Creative Commons
Alexander Laskin, Christopher P. West, Anusha P. S. Hettiyadura

et al.

Chemical Society Reviews, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

The light-absorbing chemical components of atmospheric organic aerosols are commonly referred to as Brown Carbon (BrC), reflecting the characteristic yellowish brown appearance aerosol.

Language: Английский

Citations

4
Toxic Potencies of Particulate Matter from Typical Industrial Plants Mediated with Acidity via Metal Dissolution DOI

Xiwen Song,

Di Wu, Chen Xiu

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(15), P. 6736 - 6743

Published: April 2, 2024

Acidity is an important property of particulate matter (PM) in the atmosphere, but its association with PM toxicity remains unclear. Here, this study quantitively reports effect acidity level on via pH-control experiments and cellular analysis. Oxidative stress cytotoxicity potencies acidified samples at pH 1–2 were up to 2.8–5.2 2.1–13.2 times higher than those 8–11, respectively. The toxic from real-world smoke plumes 2.3 9.1–18.2 greater 5.6, demonstrating a trend similar that samples. Furthermore, impact was manifested by promoting metal dissolution. dramatic increase 2–3 orders magnitude water-soluble content dominated variation toxicity. significant correlation between sulfate, value, Fe, IC20, EC1.5 (p < 0.05) suggested acidic sulfate could enhance dissolving insoluble metals. findings uncover superficial adverse health outcomes epidemiological research highlight control wet plume emissions mitigate effects acidity.

Language: Английский

Citations

13
Catalysis of Ferric Ions and Ferrous Ions on the Reaction of Methylglyoxal and Ammonium Sulfate DOI

Junyi Yang,

Yang Wang,

Xuefei Wang

et al.

ACS Earth and Space Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 3, 2025

Secondary brown carbon is an important component of the atmosphere. The contribution secondary atmospheric from reaction methylglyoxal (MG) with ammonium sulfate (AS) has been demonstrated in laboratory. However, mechanism still unclear, especially influenced by other factors, for example, inorganic salt. In this study, effect soluble iron salt on between MG and AS was investigated through chemical analysis methods, including optical molecular probes. results indicate that ferrous may promote MG–AS accelerate formation carbon. Ferrous exhibits a higher catalytic activity than ferric does. Moreover, indicates Fe(II) true catalyst, rate constant 13 times uncatalyzed reaction, while Fe(III) due to its reduction MG. addition, complex aqueous phase identified.

Language: Английский

Citations

0
Predictions of the Optical Properties of Brown Carbon Aerosol by Machine Learning with Typical Chromophores DOI
Ying Wang, Ru‐Jin Huang, Haobin Zhong

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(46), P. 20588 - 20597

Published: Nov. 7, 2024

The linkages between BrC optical properties and chemical composition remain inadequately understood, with quantified chromophores explaining less than 25% of ambient aerosol light absorption. This study characterized 38 typical in aerosols collected Xi'an, absorption contributions to ranging from 1.6 ± 0.3 5.8 2.6% at 365 nm. Based on these chromophores, an interpretable machine learning model the Shapley Additive Explanation (SHAP) method were employed explore relationships composition. attained high accuracy Pearson correlation coefficients (

Language: Английский

Citations

3
pH-dependent reaction kinetics between glyoxal and ammonium sulfate in simulated cloud droplets DOI
Kun Liu, Tao Wang, Guohua Zhang

et al.

Journal of Environmental Sciences, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Language: Английский

Citations

0
The critical role of aqueous-phase processes in aromatic-derived nitrogen-containing organic aerosol formation in cities with different energy consumption patterns DOI Creative Commons
Yi-Jia Ma, Yu Xu, Ting Yang

et al.

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(5), P. 2763 - 2780

Published: March 4, 2025

Abstract. Nitrogen-containing organic compounds (NOCs) impact air quality and human health. Here, the abundance, potential precursors, main formation mechanisms of NOCs in PM2.5 during winter were compared for first time among Haerbin (dependent on coal heating), Beijing (natural gas as heating energy), Hangzhou (no centralized policy). The total signal intensity CHON+, CHN+, CHON− was highest lowest Hangzhou. Anthropogenic aromatics accounted 73 %–93 % all identified precursors Haerbin. Although abundance aromatic-derived lower than Haerbin, also contributors to NOC Beijing. exhibited levels aromatic precursors. Furthermore, non-metric multidimensional scaling analysis indicated an overall reduction fossil fuel combustion pollution along route from We found that aqueous-phase processes (mainly condensation, hydrolysis, or dehydration reduced mainly oxidization hydrolysis oxidized NOCs) can promote transformation produce NOCs, leading most significant increase (particularly haze days). Reduced precursor emissions (the lowest) constrained NOCs. results suggest aerosol coal-dependent cities is controlled by anthropogenic processes. Thus, without effective emission controls, through may still pose a large threat quality.

Language: Английский

Citations

0
Different formation pathways of nitrogen-containing organic compounds in aerosols and fog water in northern China DOI Creative Commons
Wei Sun, Xiao Hu,

Yuzhen Fu

et al.

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(12), P. 6987 - 6999

Published: June 18, 2024

Abstract. While aqueous-phase processing is known to contribute the formation of nitrogen-containing organic compounds (NOCs), specific pathways involved remain poorly understood. In this study, we aimed characterize NOCs present in both pre-fog aerosols and fog water collected at a suburban site northern China. Fourier-transform ion cyclotron resonance mass spectrometry was utilized analyze molecular composition negative positive modes electrospray ionization (ESI− ESI+). samples, constituted significant portion, accounting for over 60 % all assigned formulas ESI− more than 80 ESI+. By comparing originating from biomass burning, coal combustion, vehicle emissions, identified that 72.3 were attributed primary anthropogenic sources (pNOCs), while remaining categorized as secondary formed within (saNOCs). Unique found classified (sfNOCs). Through comprehensive “precursor–product pair” screening involving 39 reaction pathways, observed nitration reaction, amine pathway, intramolecular N-heterocycle pathway NH3 addition reactions contributed 43.6 %, 22.1 11.6 saNOCs, respectively. contrast, these 26.8 28.4 29.7 sfNOCs, This disparity likely influenced by diverse precursors, aqueous acidity, gas-phase species partitioning. Correspondingly, saNOCs contain higher abundance carbohydrate-like highly oxygenated with two nitrogen atoms compared pNOCs. Conversely, sfNOCs exhibited content lipid-like fewer oxygen atoms. These results underscore distinct processes contributing diversity water, which may lead their different climate effects.

Language: Английский

Citations

3
Review of health effects driven by aerosol acidity: Occurrence and implications for air pollution control DOI

Xiwen Song,

Di Wu,

Yi Su

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 955, P. 176839 - 176839

Published: Oct. 16, 2024

Language: Английский

Citations

2
Different Formation Pathways of Nitrogen-containing Organic Compounds in Aerosols and Fog Water in Northern China DOI Creative Commons
Wei Sun, Xiao Hu,

Yuzhen Fu

et al.

Published: Feb. 5, 2024

Abstract. While aqueous-phase processing contributes to the formation of nitrogen-containing organic compounds (NOCs), detailed pathways are not well understood. In this study, molecular composition NOCs in both pre-fog aerosols and fog water collected at a suburban site northern China was characterized using Fourier-transform ion cyclotron resonance mass spectrometry negative positive modes electrospray ionization (ESI- ESI+). water, account for number fractions more than 60 % all assigned formulas ESI- mode 80 ESI+ mode. By comparing biomass burning, coal combustion, vehicle emissions, 72.3 were as originating from these primary anthropogenic sources (pNOCs), while remaining regarded secondary formed aerosol (saNOCs). On other hand, unique (sfNOCs). According “precursor-product pair” screening involving 39 reaction pathways, we found that nitration reaction, amine pathway intramolecular N-heterocycle NH3 addition reactions contribute 43.6 %, 22.1 11.6 saNOCs, but 26.8 28.4 29.7 sfNOCs, respectively. Such distinct most likely attributed diverse precursors aqueous acidity. Correspondingly, saNOCs contain abundant carbohydrates-like highly oxygenated with two nitrogen atoms compared pNOCs, whereas sfNOCs lipids-like fewer oxygen atoms. The results reveal disparity processes richness water. findings valuable understanding control pollution.

Language: Английский

Citations

1
Contribution of Aftertreatment Technologies to Alleviating SOA and Toxicity Generation from Typical Diesel Engine-Emitted I/SVOCs DOI
Yaoqiang Huo, Jianguo Liu, Di Wu

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 13, 2024

The removal capacity of aftertreatment technologies equipped on diesel exhaust in intermediate and semivolatile organic compounds (I/SVOCs) remains unclear. This study quantified the effect typical (China VI) engine-emitted I/SVOCs, related secondary aerosol (SOA), toxic effects. devices could mitigate emission factors (EFs) by 70.8 ± 3.4 to 82.5 20.9% for 72.7 18.6 77.5 4.2% SOA production, 75.7 9.3 82.4 9.2% equivalent quantity (TEQ). Aftertreatment units are better removing alkanes, benzenes, ketones. TEQ from cold-start cycle is 1.3- 5.7-fold higher than that hot-start cycle. In contrast, EFs ship-emitted I/SVOCs 3.7- 5.3-fold those vehicles with an system when burning same fuel, leading 2.1- 3.0-fold production 3.1- 6.7-fold TEQ. Implementation control marine engines reduce I/SVOC EFs, eye irritation ships 76.7 12.2, 75.1 79.1 9.6%, respectively. These results indicate it vital equip improve air quality protect human health.

Language: Английский

Citations

1