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

A comprehensive evaluation of PM2.5-bound PAHs and their derivative in winter from six megacities in China: Insight the source-dependent health risk and secondary reactions DOI Creative Commons
Jian Sun, Zhenxing Shen, Tian Zhang

et al.

Environment International, Journal Year: 2022, Volume and Issue: 165, P. 107344 - 107344

Published: June 11, 2022

Atmospheric PAHs (polycyclic aromatic hydrocarbons) and their derivatives are a global concern that influences environments threatens human health. Concentrations of 52 the main in six Chinese megacities were measured winter 2019. The concentrations ∑PAHs (sum PAHs) ranged from 19.42 ± 7.68 to 65.40 29.84 ng m-3, with significantly higher levels northern cities (Harbin [HB], Beijing [BJ], Xi'an [XA]) than southern ones (Wuhan [WH], Chengdu [CD] Guangzhou [GZ]). Source apportionment was conducted by PMF model results showed coal combustion traffic emissions two dominant sources, which dominated cities, respectively. Biomass burning also characterized as crucial source extremely high contributions XA (42.5%). Assisted individual PAH results, source-depend TEQ (total BaP equivalent) incremental lifetime cancer risk (ILCR) firstly reported these cities. highlighted biomass both ILCR, underestimated apportionment. Secondary organic aerosol-derived demonstrated increase compared fresh three parameters, namely temperature, relative humidity, O3 multiple linear regression principal factors influencing secondary reactions winter. This study provides accurate health-orientated potential control measures mitigate toxicity formed PAHs, decrease uncertainty level traditional methods. revealed great progress air pollution government past 20 years, but still long way go formulate strict emission strategies environmental health-protective perspectives.

Language: Английский

Citations

54
Variation in PM2.5 Chemical Composition During the Heating Seasons from 2018–2019 to 2020–2021 in Harbin: Response to Mitigation Strategies DOI
Qinqin Yu, Jiumeng Liu, Yuan Cheng

et al.

Aerosol Science and Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 3, 2025

Language: Английский

Citations

1
VOCs characteristics and their ozone and SOA formation potentials in autumn and winter at Weinan, China. DOI

Jianghao Li,

Shunxi Deng, Guanghua Li

et al.

Environmental Research, Journal Year: 2021, Volume and Issue: 203, P. 111821 - 111821

Published: Aug. 8, 2021

Language: Английский

Citations

52
Secondary organic aerosol formation from mixed volatile organic compounds: Effect of RO2 chemistry and precursor concentration DOI Creative Commons
Tianzeng Chen, Peng Zhang, Biwu Chu

et al.

npj Climate and Atmospheric Science, Journal Year: 2022, Volume and Issue: 5(1)

Published: Nov. 19, 2022

Abstract Secondary organic aerosol (SOA) plays a significant role in contributing to atmospheric fine particles, as well global air quality and climate. However, the current understanding of formation SOA its simulation is still highly uncertain due complexity precursor VOCs. In our study, different mixed VOC scenarios was investigated using 30 m 3 indoor smog chamber. By comparing individual scenarios, it found that yield from anthropogenic VOCs (AVOCs) can be positively (+83.9%) affected by coexisting AVOCs, while inhibited (−51.4%) presence isoprene, via OH scavenging effect. The cross-reactions peroxyl radical (RO 2 ) generated AVOCs were proved main contributor (up 39.0%) formation, highlighting importance RO + RʹO reactions scenarios. Meanwhile, gas-phase intermediates volatility categories also concentration, higher at lower concentrations larger contribution with volatility. Our study provides new insights into considering interactions between intermediate products

Language: Английский

Citations

36
Smog Chamber Study on the Role of NOxin SOA and O3Formation from Aromatic Hydrocarbons DOI
Tianzeng Chen, Peng Zhang, Qingxin Ma

et al.

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(19), P. 13654 - 13663

Published: Sept. 22, 2022

China is facing dual pressures to reduce both PM2.5 and O3 pollution, the crucial precursors of which are NOx VOCs. In our study, role in secondary organic aerosol (SOA, important constituent PM2.5) formation was examined 30 m3 indoor smog chamber. As revealed present level can obviously affect OH concentration volatility distribution gas-phase oxidation products thus SOA formation. Reducing NOx-sensitive regime inhibit (by 42%), resulting reduction capacity, suppresses 45%) by inhibiting O- N-containing with low volatility. The contribution these also estimated, results could substantially support trend yield at different VOC levels. atmospheric implications coordinated control discussed.

Language: Английский

Citations

32
Effect of relative humidity, NOx, and ammonia on the physical properties of naphthalene secondary organic aerosols DOI Creative Commons
Alexandra L. Klodt, Paige K. Aiona,

A. MacMillan

et al.

Environmental Science Atmospheres, Journal Year: 2023, Volume and Issue: 3(6), P. 991 - 1007

Published: Jan. 1, 2023

Relative humidity, NO x , and NH 3 can all alter the molecular, optical, hygroscopic properties of naphthalene SOAs, with a complex synergy between these factors.

Language: Английский

Citations

17
Relative Humidity Modulates the Physicochemical Processing of Secondary Brown Carbon Formation from Nighttime Oxidation of Furan and Pyrrole DOI Creative Commons
Kunpeng Chen, Caitlin Hamilton,

B. Ries

et al.

ACS ES&T Air, Journal Year: 2024, Volume and Issue: 1(5), P. 426 - 437

Published: April 9, 2024

Light-absorbing secondary organic aerosols (SOAs), also known as brown carbon (BrC), are major components of wildfire smoke that can have a significant impact on the climate system; however, how environmental factors such relative humidity (RH) influence their formation is not fully understood, especially for heterocyclic precursors. We conducted chamber experiments to investigate BrC from nighttime oxidation furan and pyrrole, two primary precursors in wildfires, presence pre-existing particles at RH < 20% ∼ 50%. Our findings revealed increasing significantly affected size distribution dynamics both SOAs, with pyrrole SOA showing stronger potential generate ultrafine via intensive nucleation processes. Higher led increased mass fractions oxygenated compounds suggesting enhanced gas-phase and/or multiphase under humid conditions. Moreover, higher reduced absorption coefficients BrC, contrasting those homocyclic precursors, due non-absorbing high-molecular-weight decreasing molecular chromophores. Overall, our demonstrate unique dependence which may critically modulate radiative effects change.

Language: Английский

Citations

6
Application of smog chambers in atmospheric process studies DOI Creative Commons
Biwu Chu, Tianzeng Chen, Yongchun Liu

et al.

National Science Review, Journal Year: 2021, Volume and Issue: 9(2)

Published: June 13, 2021

Smog chamber experimental systems, which have been widely used in laboratory simulation for studying atmospheric processes, are comprehensively reviewed this paper. The components, development history, main research topics and achievements of smog chambers introduced. Typical the world, including their volumes, wall materials, light sources features, summarized compared. Key factors influences on environment discussed, loss, emission background pollutants. features next-generation application prospect future studies also outlined

Language: Английский

Citations

35
A New Type of Quartz Smog Chamber: Design and Characterization DOI
Wei Ma, Yongchun Liu, Yusheng Zhang

et al.

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(4), P. 2181 - 2190

Published: Jan. 25, 2022

Since the 1960s, many indoor and outdoor smog chambers have been developed worldwide. However, most of them are made Teflon films, which relatively high background contaminations due to wall effect. We world's first medium-size quartz chamber (10 m3), is jointed with 32 pieces 5 mm thick polished glasses a stainless-steel frame. Characterizations show that this exhibits excellent performance in terms relative humidity (RH) (2–80%) temperature (15–30 ± 1 °C) control, mixing efficiency reactants (6–8 min), light transmittance (>90% above 290 nm), loss pollutants. The rates gas-phase pollutants on order 10–4 min–1 at 298 K under dry conditions. It 0.08 h–1 for 100–500 nm particles, significantly lower than those chambers. photolysis rate NO2 (JNO2) automatically adjustable simulate diurnal variation solar irradiation from 0 0.40 min–1. inner surface can be repeatedly washed deionized water, resulting low contaminations. Both experiments (toluene–NOx α-pinene–ozone systems) box model demonstrate new provide high-quality data investigating SOA O3 formation atmosphere.

Language: Английский

Citations

24
Applications of environmental mass spectrometry in atmospheric haze chemistry DOI
Tianzeng Chen, Yanli Ge, Biwu Chu

et al.

TrAC Trends in Analytical Chemistry, Journal Year: 2024, Volume and Issue: 172, P. 117614 - 117614

Published: Feb. 21, 2024

Language: Английский

Citations

5