Comment on acp-2023-11 DOI Creative Commons
Xiaodong Xie, Jianlin Hu, Momei Qin

et al.

Published: April 3, 2023

Abstract. Atmospheric age reflects how long particles have been suspended in the atmosphere, which is closely associated with evolution of air pollutants. Severe regional haze events occur frequently China, influencing quality, human health, and climate. Previous studies explored characteristics mass concentrations compositions fine particulate matter (PM2.5) during events, but atmospheric remains unclear. In this study, age-resolved UCD/CIT model was developed applied to simulate concentration distribution PM2.5 a severe episode eastern China. The results indicated that North China Plain (NCP) gradually accumulated due stagnant weather conditions at beginning stage event. Accordingly, elemental carbon (EC), primary organic aerosol (POA), sulfate (SO42−), secondary (SOA) increased. subsequent growth driven by local chemical formation nitrate (NO3−) under high relative humidity. newly formed NO3− led decrease mean particles. During transport stage, aged from NCP moved downwind Yangtze River Delta (YRD) region, leading sharp increase average EC, POA, SO42−, SOA. contrast, ammonium remained unchanged or even slightly decreased continuous YRD region. Different among these components provides unique perspective on information can also be used for designing effective control strategies different PM2.5.

Language: Английский

Decade-long trends in chemical component properties of PM2.5 in Beijing, China (2011−2020) DOI
Jiaqi Wang, Jian Gao,

Fei Che

et al.

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 832, P. 154664 - 154664

Published: March 18, 2022

Language: Английский

Citations

47
Implications for ozone control by understanding the survivor bias in observed ozone-volatile organic compounds system DOI Creative Commons
Zhenyu Wang, Zongbo Shi, Feng Wang

et al.

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

Published: May 13, 2022

Abstract Tropospheric ozone (O 3 ) affects Earth’s climate and human health. Volatile organic compounds (VOCs), major contributors to O formation, are of particular interest. Generally, the measured concentrations VOCs (M-VOCs) show nonlinear or even opposite time serial-trend. We attributed phenomenon survivor bias: lack insight photochemically consumed (C-VOCs) which emitted from sources ambient devote forming , while excessive concern on at observation site. Both observational model results provide evidence that C-VOCs key formation. proposed an improved quantify source contributions (biogenic emissions, gasoline evaporation, industry, etc.) their impacts formation successfully avoiding misidentification dominant originated bias in data. The found this study highlights focusing M-VOCs directly is insufficient demonstrates necessity capture contribute

Language: Английский

Citations

45
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
Dramatic changes in aerosol composition during the 2016–2020 heating seasons in Beijing–Tianjin–Hebei region and its surrounding areas: The role of primary pollutants and secondary aerosol formation DOI
Jiaqi Wang, Jian Gao,

Fei Che

et al.

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 849, P. 157621 - 157621

Published: July 25, 2022

Language: Английский

Citations

24
Tracing the Formation of Secondary Aerosols Influenced by Solar Radiation and Relative Humidity in Suburban Environment DOI
Yangzhou Wu, Dantong Liu, Ping Tian

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2022, Volume and Issue: 127(17)

Published: Sept. 1, 2022

Abstract Secondary particulate matter exerts adverse effects on air quality and human health. The production or reaction rate of secondary aerosols in polluted environments remains uncertain is complicated by diverse emissions meteorological conditions. By concurrently measuring the mass spectra compounds both (using an aerosol spectrometer) gas phases proton‐transfer‐reaction spectrometry) suburban Beijing, we linked organic (OA) volatile (VOCs) to photochemical age ( t ) obtained their rates. Factorization analysis OA 108 VOC species resolved three oxygenated OAs (OOA) factors at different oxidation levels. Primary VOCs from traffic sources were determined be important for formation. At high pollution levels under conditions weaker solar radiation higher relative humidity, moderately (O/C = 0.61) inorganics coproduced combination with rapid consumption all VOCs. lower levels, intense caused substantial OOA 0.81) intermediate (both a state) 15.0% h −1 14.0% , respectively. These results highlight feedback between moisture terms altering formation mechanism aerosols. In particular, highly airborne products strong should considered regard environmental impact.

Language: Английский

Citations

24
Breathing in danger: Unveiling the link between human exposure to outdoor PM2.5-bound polycyclic aromatic hydrocarbons and lung cancer risk in an urban residential area of China DOI

Lord Famiyeh,

Honghui Xu,

Ke Chen

et al.

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 907, P. 167762 - 167762

Published: Oct. 16, 2023

Language: Английский

Citations

14
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
Increasing atmospheric oxidizing capacity weakens emission mitigation effort in Beijing during autumn haze events DOI
Tian Feng, Shuyu Zhao,

Naifang Bei

et al.

Chemosphere, Journal Year: 2021, Volume and Issue: 281, P. 130855 - 130855

Published: May 22, 2021

Language: Английский

Citations

31
Evolution of atmospheric age of particles and its implications for the formation of a severe haze event in eastern China DOI Creative Commons
Xiaodong Xie, Jianlin Hu, Momei Qin

et al.

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(18), P. 10563 - 10578

Published: Sept. 25, 2023

Abstract. Atmospheric age reflects how long particles have been suspended in the atmosphere, which is closely associated with evolution of air pollutants. Severe regional haze events occur frequently China, influencing quality, human health, and climate. Previous studies explored characteristics mass concentrations compositions fine particulate matter (PM2.5) during events, but atmospheric remains unclear. In this study, age-resolved University California, Davis/California Institute Technology (UCD/CIT) model was developed applied to simulate concentration distribution PM2.5 a severe episode eastern China. The results indicated that North China Plain (NCP) gradually accumulated due stagnant weather conditions beginning stage event. Accordingly, elemental carbon (EC), primary organic aerosol (POA), sulfate (SO42-), secondary (SOA) increased. subsequent growth driven by local chemical formation nitrate (NO3-) under high relative humidity. newly formed NO3- led decrease mean particles. During transport stage, aged from NCP moved downwind Yangtze River Delta (YRD) region, leading sharp increase average EC, POA, SO42-, SOA YRD. contrast, ammonium remained unchanged or even slightly decreased continuous YRD region. Different among these components provides unique perspective on information can also be used for designing effective control strategies different PM2.5.

Language: Английский

Citations

11