Environmental Science and Pollution Research, Journal Year: 2023, Volume and Issue: 30(45), P. 101522 - 101534
Published: Aug. 31, 2023
Language: Английский
Atmospheric Environment, Journal Year: 2023, Volume and Issue: 301, P. 119709 - 119709
Published: March 14, 2023
Language: Английский
Citations
19
Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(5), P. 2803 - 2820
Published: March 4, 2024
Abstract. Despite significant improvements in air quality recent years, the Sichuan Basin (SCB) is still facing frequent haze pollution winter, and causes of severe formation have not yet been fully investigated. In this study, chemical components PM2.5 (i.e., particulate matter with an aerodynamic diameter less than 2.5 µm) a typical period at beginning 2023 Chengdu, megacity SCB, were characterized by bulk-chemical single-particle analysis, sources mechanism analyzed. The average mass concentration during study was 95.6 ± 28.7 µg m−3. Organic (OM) most abundant component (35.3 %), followed nitrate (22.0 sulfate (9.2 %) ammonium (7.8 %). individual aerosol particles classified into five categories, i.e., mineral, OM, secondary inorganic (SIA), soot fly ash/metal particles, them state being internally mixed. entire observation could be divided two non-pollution periods (NP-1 NP-2) (Haze-1 Haze-2). With evolution pollution, analysis exhibited similar characteristics, suggesting that Haze-1 mainly caused pollutants related to fossil fuel combustion, especially local mobile sources, while Haze-2 triggered rapidly increasing pollutants, which came from regional transmission. included dust (8.5 biomass burning (3.5 coal combustion (15.4 industrial processes (6.5 vehicular emissions (25.6 (40.5 Analysis Weather Research Forecasting model Chemistry (WRF-Chem) results showed contributions transmission Chengdu same (50 % vs. 50 addition, source composition WRF-Chem simulation different confirmed our mechanisms events. This confirms further reductions are needed, more effective policies for emission reduction or joint prevention control will necessary future.
Language: Английский
Citations
6
Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(3), P. 1563 - 1576
Published: Jan. 6, 2024
Uncertain chemical mechanisms leading to brown carbon (BrC) formation affect the drivers of radiative effects aerosols in current climate predictions. Herein, aqueous-phase reactions methylglyoxal (MG) and typical reduced nitrogen species (RNSs) are systematically investigated by using combined quantum calculations laboratory experiments. Imines diimines identified from mixtures methylamine (MA) ammonia (AM) with MG, but not dimethylamine (DA) MG mixture under acidic conditions, because deprotonation DA cationic intermediates is hindered amino groups occupied two methyl groups. It leads N-heterocycle (NHC) + MA (MGM) AM (MGA) reaction systems N-containing chain oligomer (MGD) system. Distinct product attributed electrostatic attraction steric hindrance, which regulated RNSs. The light absorption adverse NHCs also strongly related Our finding reveals that BrC mainly contributed RNSs less groups, have more abundant broad sources urban environments.
Language: Английский
Citations
5
The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 904, P. 166582 - 166582
Published: Aug. 26, 2023
Language: Английский
Citations
13
Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(23), P. 10185 - 10194
Published: May 28, 2024
The relaxation of restrictions on Chinese Spring Festival (SF) firework displays in certain regions has raised concerns due to intensive emissions exacerbating air quality deterioration. To evaluate the impacts fireworks quality, a comparative investigation was conducted city between 2022 (restricted fireworks) and 2023 SF (unrestricted), utilizing high time-resolution field observations particle chemical components model simulations. We observed two severe PM2.5 pollution episodes primarily triggered by exacerbated static meteorology (contributing approximately 30%) during SF, contrasting with its absence 2022. During displays, freshly emitted particles containing more primary inorganics (such as chloride metals like Al, Mg, Ba), elemental carbon, organic compounds (including polycyclic aromatic hydrocarbons) were predominant; subsequently, aged secondary became prevalent continued worsen quality. from constituted 54% contributing peak hourly concentration 188 μg/m3 representing over 70% ambient PM2.5. This study underscores that caution should be exercised when igniting substantial under stable meteorological conditions, considering both potential effects.
Language: Английский
Citations
4
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
Toxics, Journal Year: 2025, Volume and Issue: 13(4), P. 272 - 272
Published: April 2, 2025
Oligomerization of glyoxal (GL) and methylglyoxal (MG) plays a vital role in secondary organic aerosol (SOA) formation aqueous aerosols. However, the influence emerging contaminants on oligomerization GL MG remains unclear. Therefore, using quantum chemical kinetic calculations, we investigated presence phthalate esters (PAEs), including dimethyl (DMP), diethyl (DEP), dipropyl (DPP), dibutyl (DBP), PAEs oligomerization. Our findings indicate that direct PAE-mediated is hindered due to lack reactive sites. readily mediated by hydrolysates PAEs, which are preferred forms weakly acidic aerosols, attributable additional -OH groups. The mechanisms show indirect proceeds via three-step reactions, nucleophilic attack carbenium ions, hydration, deprotonation, thermodynamically kinetically favorable. results reveal GL/MG needs be emphasized, particularly conditions with pH value approaching neutrality.
Language: Английский
Citations
0
The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 947, P. 174196 - 174196
Published: June 26, 2024
China is currently one of the countries impacted by severe atmospheric ozone (O
Language: Английский
Citations
3
Advances in Atmospheric Sciences, Journal Year: 2024, Volume and Issue: 41(10), P. 1936 - 1952
Published: Aug. 28, 2024
Language: Английский
Citations
0
Environmental Science and Pollution Research, Journal Year: 2023, Volume and Issue: 30(45), P. 101522 - 101534
Published: Aug. 31, 2023
Language: Английский
Citations
0