Reply on RC2 DOI Creative Commons
Qiyuan Wang

Опубликована: Июль 4, 2023

Abstract. Fine particulate matter (PM2.5) pollution is still one of China's most important environmental issues, especially in northern cities during wintertime. In this study, intensive real-time measurement campaigns were conducted Xi’an, Shijiazhuang, and Beijing to investigate the chemical characteristics source contributions PM2.5 explore formation progress heavy for policy implications. The compositions three all dominated by organic aerosol (OA) nitrate (NO3-). Results apportionment analyzed hybrid receptor model (HERM) showed that secondary plus sulfate contributed higher compared other primary sources. Biomass burning was dominant pilot cities. contribution coal combustion non-negligible Xi’an Shijiazhuang but no longer contributor capital city due execution a strict coal-banning policy. potential mechanisms further explored establishing correlations between liquid water content (ALWC), Ox (O3 + NO2), respectively. results photochemical oxidation aqueous-phase reaction two pathways formation. According variations, air events occurred classified into types: biomass dominated, combination Additionally, study changes composition past decades. suggested clean energy replacements rural household should be urgently encouraged reduce emissions China, collaborative control on ozone need continuously promoted weaken atmosphere capacity sake reducing

Язык: Английский

Does low carbon energy transition impede air pollution? Evidence from China's coal-to-gas policy DOI
Xueyang Wang,

Xiumei Sun,

Mahmood Ahmad

и другие.

Resources Policy, Год журнала: 2023, Номер 83, С. 103723 - 103723

Опубликована: Май 18, 2023

Язык: Английский

Процитировано

30

High-time-resolution chemical composition and source apportionment of PM2.5 in northern Chinese cities: implications for policy DOI Creative Commons
Yong Zhang, Jie Tian, Qiyuan Wang

и другие.

Atmospheric chemistry and physics, Год журнала: 2023, Номер 23(16), С. 9455 - 9471

Опубликована: Авг. 25, 2023

Abstract. Fine particulate matter (PM2.5) pollution is still one of China's most important environmental issues, especially in northern cities during wintertime. In this study, intensive real-time measurement campaigns were conducted Xi'an, Shijiazhuang, and Beijing to investigate the chemical characteristics source contributions PM2.5 explore formation heavy for policy implications. The compositions three all dominated by organic aerosol (OA) nitrate (NO3-). Results apportionment analyzed a hybrid receptor model (HERM) showed that secondary contributed more compared other primary sources. Biomass burning was dominant pilot cities. contribution coal combustion non-negligible Xi'an Shijiazhuang but no longer an contributor capital city due execution strict coal-banning policy. potential mechanisms further explored establishing correlations between sources liquid water content (ALWC) Ox (O3+NO2), respectively. results photochemical oxidation aqueous-phase reaction two pathways formation. According variations, air events occurred classified into types: biomass-combustion-dominated, secondary-formation-source-dominated, combination Additionally, study compares changes composition past decades. suggest clean-energy replacements rural households should be urgently encouraged reduce emissions China, collaborative control on ozone needs continuously promoted weaken atmosphere capacity sake reducing

Язык: Английский

Процитировано

22

Secondary Organic Aerosol Formation from Ambient Air in Summer in Urban Beijing: Contribution of S/IVOCs and Impacts of Heat Waves DOI
Zijun Zhang,

Weiqi Xu,

Siqi Zeng

и другие.

Environmental Science & Technology Letters, Год журнала: 2024, Номер 11(7), С. 738 - 745

Опубликована: Июнь 21, 2024

Semivolatile and intermediate volatility organic compounds (S/IVOCs) are known as crucial precursors of secondary aerosols (SOA), yet their specific contributions to SOA in urban areas remain unclear. Here, we investigate the real-time formation from ambient air summer Beijing utilizing an oxidation flow reactor (OFR), coupled with aerosol proton-transfer-reaction mass spectrometers. Our results show that maximum photochemical OFR reached 2.9 μg m–3 at ∼1.5 days age. Primary OA less oxidized oxygenated experience loss high ages (>3 days) OFR, whereas more continues enhancement, indicating role heterogeneous processes highly aged SOA. Closure studies demonstrate estimated contribute 50.0 ± 17.3% measured The relatively low contribution (10.3 5.2%) IVOCs emphasizes importance unmeasured S/IVOCs formation. Furthermore, illustrate impact heat waves on by enhancing biogenic emissions summer.

Язык: Английский

Процитировано

6

Source apportionment of fine particulate matter at a megacity in China, using an improved regularization supervised PMF model DOI
Bo Xu, Xu Han,

Huan Zhao

и другие.

The Science of The Total Environment, Год журнала: 2023, Номер 879, С. 163198 - 163198

Опубликована: Апрель 1, 2023

Язык: Английский

Процитировано

13

Insights Into Formation and Aging of Secondary Organic Aerosol From Oxidation Flow Reactors: A Review DOI
Zijun Zhang,

Weiqi Xu,

Andrew T. Lambe

и другие.

Current Pollution Reports, Год журнала: 2024, Номер 10(3), С. 387 - 400

Опубликована: Апрель 16, 2024

Язык: Английский

Процитировано

4

Unveiling differences in source apportionment and optical properties of wintertime carbonaceous aerosols in northern and southern Chinese Cities DOI Creative Commons
Rui Li, Qiyuan Wang, Jie Tian

и другие.

Research Square (Research Square), Год журнала: 2025, Номер unknown

Опубликована: Март 24, 2025

Abstract Carbonaceous aerosols adversely affect air quality, visibility and public health. Understanding their regional variations sources in China is essential for improving quality control. were collected during winter four major Chinese cities—Xi'an (XA), Shijiazhuang (SJZ), Wuhan (WH), Chongqing (CQ)—to investigate pollution characteristics. A comprehensive analysis of various carbon fractions was conducted, including organic (OC), elemental (EC), specific subfractions such as OC1 – OC4, EC1 EC3, char-EC, soot-EC. Using the hybrid environmental receptor model (HERM), we identified emission quantified contributions to primary total (PTC) these urban areas. The findings demonstrate substantial impacts from coal combustion heating season XA SJZ. Vehicular emissions account a considerable proportion, particularly SJZ, corresponding with increase automobile ownership that city. In WH CQ, industrial residential utilization, especially steel industry, are markedly higher. Additionally, COVID-19 pandemic results reduced We further optical characteristics EC, revealing average mass absorption efficiency (MAE) values across cities consistent previous studies. Specifically, MAEs derived different indicate higher biomass burning stationary whereas result elevated SJZ WH. This study delineates distinct carbonaceous northern southern cities, providing robust scientific basis mitigation strategies.

Язык: Английский

Процитировано

0

Characteristics of volatile organic compounds and secondary organic aerosol pollution in different functional areas of petrochemical industrial cities in Northwest China DOI
Yanping Yang, Wenkai Guo, Jian Sun

и другие.

The Science of The Total Environment, Год журнала: 2022, Номер 858, С. 159903 - 159903

Опубликована: Ноя. 2, 2022

Язык: Английский

Процитировано

16

Measurement report: Volatile organic compound characteristics of the different land-use types in Shanghai: spatiotemporal variation, source apportionment and impact on secondary formations of ozone and aerosol DOI Creative Commons
Yu Han, Tao Wang, Rui Li

и другие.

Atmospheric chemistry and physics, Год журнала: 2023, Номер 23(4), С. 2877 - 2900

Опубликована: Март 3, 2023

Abstract. Volatile organic compounds (VOCs) have important impacts on air quality, atmospheric chemistry and human health. In order to identify the spatiotemporal variations, sources ozone (O3) secondary aerosol (SOA) formation potentials of VOCs, a concurrent multi-site observation campaign was performed at supersites Shanghai, East China, in first three months 2019. The sampling sites are located different land-use types, including an industrial district (the Jinshan site: JS), residential commercial mixed districts Pudong PD) background Qingpu QP) Shanghai. During period, average VOC concentrations were sensitive types JS (21.88 ± 12.58 ppb) > PD (21.36 8.58 QP (11.93 6.33 sites. predominant category alkanes (49.32 %–71.48 %), followed by aromatics (10.70 %–21.00 alkenes (10.13 %–15.30 %) alkynes (7.69 %–14.80 studied There distinct diurnal variations “weekend effects” VOCs increased 27.15 %, 32.85 % 22.42 during haze events relative clean days. Vehicle exhaust determined as source. second-largest contributor identified production sites, while it proved be fuel evaporation site. emission biomass burning showed slight contributions JS/PD respectively. This consistent with regional characteristics anthropogenic activities dominated types. High potential source contribution function (PSCF) values primarily appeared northeastern northern areas surrounding suggesting strong local emissions. (OFP) each type (50.89 2.63 (33.94 1.52 (24.26 1.43 being contributors. Secondary (SOAFP), mainly contributed aromatics, highest site (1.00 2.03 µg m−3), (0.46 0.88 m−3) (0.41 0.58 VOC–PM2.5 sensitivity analysis that displayed more rapid increment along increase PM2.5 other two Alkenes both key concerns controlling VOC-related pollution O3 SOA These findings provide information accurate air-quality control city level China. results shown herein highlight simultaneous measurements megacity or cluster could appropriate for fully understanding single-site measurement normally.

Язык: Английский

Процитировано

9

Characterization, sources and reactivity of carbonyl volatile organic compounds in North China: Based on long-term observations DOI
Ziyan Chen, Kaitao Chen, Xingru Li

и другие.

Journal of Environmental Sciences, Год журнала: 2025, Номер unknown

Опубликована: Март 1, 2025

Язык: Английский

Процитировано

0

RETRACTED: An assessment of volatile organic compounds pollutant emissions from wood materials: A review DOI

Xihe Zhou,

Zhisong Yan,

Xiang Zhou

и другие.

Chemosphere, Год журнала: 2022, Номер 308, С. 136460 - 136460

Опубликована: Сен. 15, 2022

Язык: Английский

Процитировано

12