Characteristics of PM2.5 in an Industrial City of Northern China: Mass Concentrations, Chemical Composition, Source Apportionment, and Health Risk Assessment DOI Creative Commons
Wenyu Bai, Xueyan Zhao,

Baohui Yin

et al.

International Journal of Environmental Research and Public Health, Journal Year: 2022, Volume and Issue: 19(9), P. 5443 - 5443

Published: April 29, 2022

Urban and suburban PM2.5 samples were collected simultaneously during selected periods representing each season in 2019 Zibo, China. Samples analysed for water-soluble inorganic ions, carbon components, elements. A chemical mass balance model health risk assessment used to investigate the source contributions human risks posed by various pollution sources via inhalation pathway. Almost 50% of exceeded secondary standard China’s air quality concentration limit (75 µg/m3, 24 h). Water-soluble ions main component accounting 50 ± 8% 56 11% at urban sites, respectively. OC OC/EC decreased significantly past few years due enhanced energy restructuring. Pearson correlation analysis showed that traffic emissions heavy metals. The Cr(VI) concentrations 1.53 1.92 ng/m3 respectively, exceeding national ambient standards 0.025 ng/m3. Secondary aerosols, emissions, organic aerosols dominant contributors with total from these three approximately 80% remaining 20% attributed emissions. non-carcinogenic crustal dust children 2.23 1.15 areas, safe 1.0 both locations, as was case adults areas. Meanwhile, carcinogenic all below limit, being just limits. Strict control precursor such SO2, NOx, VOCs, is a good way reduce resulting aerosols. Traffic control, limiting or preventing outdoor activities, wearing masks haze episodes may be also helpful reducing its impacts Zibo.

Language: Английский

Atmospheric oxidation of 1,3-butadiene: influence of seed aerosol acidity and relative humidity on SOA composition and the production of air toxic compounds DOI Creative Commons
Mohammed Jaoui, Klara Nestorowicz, Krzysztof J. Rudziński

et al.

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(2), P. 1401 - 1432

Published: Jan. 31, 2025

Abstract. This study investigated the effect of relative humidity (RH) on chemical composition gas and particle phases formed from photooxidation 1,3-butadiene (13BD) in presence NOx under acidified non-acidified seed aerosol. The experiments were conducted a 14.5 m3 smog chamber operated steady-state mode. Products identified by high-performance liquid chromatography, chromatography–mass spectrometry, ultrahigh-performance chromatography coupled with high-resolution mass spectrometry. More than 50 oxygenated products identified, including 33 organics, 10 organosulfates (OSs), PAN, APAN, glyoxal, formaldehyde, acrolein. Secondary organic aerosol (SOA) reaction depended RH acidity Based Extended Aerosol Inorganics Model (E-AIM), originated solutions was found to exist aqueous solid phases, respectively. Although terms “acidified” “non-acidified” are true for which seeds atomized, there far more fundamental differences between phase states species partition or (aqueous/solid), considerably affects their partitioning formation mechanisms. SOA most (i) higher conditions, where particles deliquescent, did not contain any phase; (ii) increased conditions; (iii) decreased increasing RH. Glyceric acid, threitols, threonic acids, four dimers, three unknowns, among main measured either conditions across all levels. Total secondary carbon yield both conditions. photochemical reactivity 13BD our systems faster To determine contribution ambient aerosol, we analyzed PM2.5 samples collected at European monitoring stations located Poland. occurrence several (e.g., glyceric tartronic tartaric OSs) field suggests that could contribute formation.

Language: Английский

Citations

0
The importance of burning conditions on the composition of domestic biomass-burning organic aerosol and the impact of atmospheric ageing DOI Creative Commons
R. Evans, Daniel J. Bryant, Aristeidis Voliotis

et al.

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(8), P. 4367 - 4389

Published: April 22, 2025

Abstract. Domestic biomass burning is a significant source of organic aerosol (OA) to the atmosphere; however, understanding OA composition under different conditions and after oxidation largely unknown. Compositional analysis often limited by lack analytical standards available for quantification; semi-quantitative non-target (NTA) can overcome these limitations enabling detection thousands compounds quantification via surrogate standards. A series controlled-burn experiments were conducted at Manchester Aerosol Chamber investigate domestic biomass-burning (BBOA) impact atmospheric ageing. Insights into chemical fresh aged from flaming-dominated smouldering-dominated combustion obtained newly developed NTA approach using ultra-high-performance liquid chromatography high-resolution mass spectrometry. burns contained carbon content, whereas it was primarily black carbon. The detectable both dominated oxygenated (CHO) (≈ 90 %) with smaller contributions organonitrogen species. Primary (POA) had high concentration C8–C17CHO compounds, exhibiting peak between C8–C11. However, POA exhibited greater contribution C13–C17 CHO More than 50 % in determined as aromatic aromaticity index, form functionalised monoaromatic compounds. After ageing, total decreased loss smouldering (−53 flaming (−16 due increased reduction polyaromatic conditions. O:C ratios consistent those (0.57–1.00), suggesting that compositional changes upon ageing driven aromaticity. there probability ≥ 0.8 OA, indicating presence more oxidised This study presents first reported quantitative BBOA retention window scaling demonstrates burn phase may have important consequences exposure such emissions residential settings.

Language: Английский

Citations

0
Measurement report: The variation properties of aerosol hygroscopic growth related to chemical composition during new particle formation days in a coastal city of Southeast China DOI Creative Commons
Lingjun Li,

Mengren Li,

Xiaolong Fan

et al.

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(6), P. 3669 - 3685

Published: March 27, 2025

Abstract. The scattering of solar radiation by aerosol is significantly affected relative humidity (RH) due to the hygroscopicity. In order better understand characteristics hygroscopic growth and its influencing factors during new particle formation (NPF) days, we conducted an in situ campaign from February April 2022 Xiamen, a coastal city Southeast China. factor f(RH), commonly used describe indirectly hygroscopicity, varies greatly influence chemical composition size. relatively clean atmosphere NPF events occur frequently, variation has substantial on growth. this study, investigated features f(RH) days. research results emphasized that differed between non-NPF mainly impacted compositions, especially sulfate nitrate. On was dominant contributor distinguishing it Aerosol hygroscopicity–chemical closure demonstrated NH4HSO4 main driving force (30.78 %) hygroscopicity parameter κf(RH) when happened, while NH4NO3 played role (up 35 for Although uncertainty organic (OA) might exist varieties components oxidation level, crucial findings study would be helpful further understanding properties area, complement models air quality climate change.

Language: Английский

Citations

0
Secondary Organic Aerosol Formation through Photochemical Oxidation of NO and SO2 in an Indoor Smog Chamber DOI

Chan Ju Kho,

Soeun Moon,

Jae Young Lee

et al.

Journal of Environmental Engineering, Journal Year: 2025, Volume and Issue: 151(6)

Published: March 31, 2025

Language: Английский

Citations

0
Revisiting the Effects of Seed Liquid Water Content on Isoprene Secondary Organic Aerosol Growth DOI
Yuzhi Chen, Gregory W. Vandergrift, Claire E. Moffett

et al.

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

Published: April 19, 2025

Language: Английский

Citations

0
Secondary organic aerosol formation from monocyclic aromatic hydrocarbons: insights from laboratory studies DOI
Zhaomin Yang, Lin Du, Yongjie Li

et al.

Environmental Science Processes & Impacts, Journal Year: 2022, Volume and Issue: 24(3), P. 351 - 379

Published: Jan. 1, 2022

This review summarizes in detail the current knowledge chemical compositions, formation mechanisms, and physicochemical properties of secondary organic aerosols formed from monocyclic aromatic hydrocarbons.

Language: Английский

Citations

15
Synergistic Effects of SO2 and NH3 Coexistence on SOA Formation from Gasoline Evaporative Emissions DOI
Tianzeng Chen, Peng Zhang, Biwu Chu

et al.

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(16), P. 6616 - 6625

Published: April 13, 2023

Vehicular evaporative emissions make an increasing contribution to anthropogenic sources of volatile organic compounds (VOCs), thus contributing secondary aerosol (SOA) formation. However, few studies have been conducted on SOA formation from vehicle VOCs under complex pollution conditions with the coexistence NOx, SO2, and NH3. In this study, synergistic effects SO2 NH3 gasoline NOx were examined using a 30 m3 smog chamber aid series mass spectrometers. Compared systems involving or alone, had greater promotion effect formation, which was larger than cumulative two promotions alone. Meanwhile, contrasting oxidation state (OSc) in presence absence observed, could further increase OSc The latter attributed wherein N–S–O adducts can be formed reaction N-heterocycles generated Our study contributes understanding highly its atmospheric implications.

Language: Английский

Citations

9
The impact of low emission zones on personal exposure to ultrafine particles in the commuter environment DOI Creative Commons
Hamesh Patel, Nick P. Talbot, Kim N. Dirks

et al.

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 874, P. 162540 - 162540

Published: March 3, 2023

Auckland is a city with limited industrial activity, road traffic being the dominant source of air pollution. Thus, time periods when social contact and movement in were severely curtailed due to COVID-19 restrictions presented unique opportunity observe impacts on pedestrian exposure pollution under range different flow scenarios, providing insights into potential future calming measures. Pedestrian ultrafine particles (UFPs), was measured using personal monitoring along customised route through Central during COVID-19-affected conditions. Results showed that reduced flows led statistically significant reductions average UFP all reduction scenarios (TRS). However, size variable both place. Under most stringent TRS (traffic 82 %), median particle (UFP) concentrations by 73 %. less scenario, extent varied space; 62 % resulted 23 2020 but 2021 similar decrease 71 magnitude impact route, areas dominated emissions from construction ferry/port activities showing little correlation between exposure. Shared spaces, previously pedestrianised, also recorded consistently high variability observed. This study provided assess benefits risks such zones help decision-makers evaluate management interventions (such as low zones). The results suggest controlled can result UFPs, sensitive local-scale variations meteorology, urban land use patterns.

Language: Английский

Citations

8
Distinct seasonal variability of source-dependent health risks from PM2.5-bound PAHs and related derivatives in a megacity, southwest China: Implications for the significance of secondary formation DOI

Weiwei Hao,

Bo Gao, Bo Liang

et al.

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 885, P. 163742 - 163742

Published: April 26, 2023

Language: Английский

Citations

8
Recent advances on SOA formation in indoor air, fate and strategies for SOA characterization in indoor air - A review DOI Creative Commons

Klaudia Pytel,

Renata Marcinkowska, Małgorzata Rutkowska

et al.

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 843, P. 156948 - 156948

Published: June 23, 2022

Recent studies proves that indoor air chemistry differs in many aspects from atmospheric one. People send up to 90 % of their life indoors being exposed pollutants present gas, particle and solid phase. Particle phase is composed particles emitted various sources, among which there an source - secondary chemical reactions leading formation organic aerosol (SOA). Lately, researchers' attentions turned towards the ultrafine particles, for are still a lot gaps knowledge concerning this field study, while evidence negative influence on human health. Presented review sums current about environment development analytical techniques applied study those processes. The biggest concern today studying ROS, lifetime very short due at beginning terpene oxidation process. Another interesting aspect recently discovered monoterpene autooxidation process leads HOMs turn can SOA yield. A complex covering gas characterization, but also toxicological crucial fully understand formation.

Language: Английский

Citations

13