Approaches for identifying PM2.5 source types and source areas at a remote background site of South China in spring

Zhang, Kai; Shang, Xiaona; Herrmann, Hartmut; Fan, Meng; Mo, Zhaoyu; Chen, Jianhua; Lv, Wenli

doi:10.1016/j.scitotenv.2019.07.178

Cited by 24 publications

(11 citation statements)

References 47 publications

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“…The CWT method first computes the weighted concentrations of trajectories and then obtains the weighted concentrations of grids [38]. The calculation formula of the CWT method is given as follows:…”

Section: (4) Concentration Weighted Trajectory (Cwt)mentioning

confidence: 99%

Transport Pathways and Potential Source Region Contributions of PM2.5 in Weifang: Seasonal Variations

Dai

Liu

et al. 2020

Applied Sciences

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As air pollution becomes progressively more serious, accurate identification of urban air pollution characteristics and associated pollutant transport mechanisms helps to effectively control and alleviate air pollution. This paper investigates the pollution characteristics, transport pathways, and potential sources of PM2.5 in Weifang based on PM2.5 monitoring data from 2015 to 2016 using three methods: Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT), the potential source contribution function (PSCF), and concentration weighted trajectory (CWT). The results show the following: (1) Air pollution in Weifang was severe from 2015 to 2016, and the annual average PM2.5 concentration was more than twice the national air quality second-level standard (35 μg/m3). (2) Seasonal transport pathways of PM2.5 vary significantly: in winter, spring and autumn, airflow from the northwest and north directions accounts for a large proportion; in contrast, in summer, warm-humid airflows from the ocean in the southeastern direction dominate with scattered characteristics. (3) The PSCF and CWT results share generally similar characteristics in the seasonal distributions of source areas, which demonstrate the credibility and accuracy of the analysis results. (4) More attention should be paid to short-distance transport from the surrounding areas of Weifang, and a joint pollution prevention and control mechanism is critical for controlling regional pollution.

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Section: (4) Concentration Weighted Trajectory (Cwt)mentioning

confidence: 99%

Transport Pathways and Potential Source Region Contributions of PM2.5 in Weifang: Seasonal Variations

Dai

Liu

et al. 2020

Applied Sciences

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“…Additionally, the concentration of CHR was also extraordinarily high, especially in the particulate phase. CHR was reported to exhibit high emission factors from both gasoline and diesel vehicles [47][48][49].…”

Section: Concentrations Of Pahsmentioning

confidence: 99%

“…The source regions of these three clusters were supposed to have different influences on the concentrations of PAHs at Weizhou Island due to their different emission characteristics. The air mass with trajectories from southeast (cluster C1), east (cluster C2) and northeast (cluster C3) might be affected by spring biomass burning in the northern Southeast Asia, vessel emission from maritime transport, and industrial coal combustion, respectively [49][50][51][52]. For the 26 sampling days, back trajectories were divided into the above three types.…”

Section: Diagnostic Sources Of Pahsmentioning

confidence: 99%

Levels, Sources and Toxicity Risks of Polycyclic Aromatic Hydrocarbons at an Island Site in the Gulf of Tonkin

Yang

Liu

Gao

et al. 2020

IJERPH

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The varying concentrations of polycyclic aromatic hydrocarbons (PAHs) at remote islands is an important indicator, demonstrating the contributions from different regional combustion sources. In this study, gaseous and particulate PAHs were measured at Weizhou Island in the Gulf of Tonkin from 15th March to 14th April, 2015. The concentrations of PAHs ranged from 116.22 to 186.74 ng/m3 and from 40.19 to 61.86 ng/m3 in gas and particulate phase, respectively, which were much higher than those of some remote sites in Asia. Phenanthrene, fluoranthene, pyrene, and chrysene, which were mainly found in diesel vehicle emissions, had relatively high concentrations in both gas and particulate phases. According to the comprehensive results of back trajectory cluster analysis and diagnostic ratios, the local vessel emission was probably the main source of PAHs, which was much more important than the coal and biomass combustion sources from remoter regions. The toxicities represented by ∑PAH7, benzo(a)pyrene-equivalent carcinogenic power, and 2,3,7,8-tetrachlorodibenzo-p-dioxin-based total toxicity potency are much higher in particulate phase than those in gas phase. However, the toxicities of gas phase should not be neglected from the point of view of indirect-acting mutagenicities due to the high contribution of fluoranthene.

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“…Biomass burning, coal burning, and external source were the three least important sources, accounting for 4%, 4%, and 3%. After 2013, secondary source (22%) and traffic (20%) were still the two foremost pollution sources [61,[123][124][125][126][127][128][129]. The proportion of industrial factors (13%) was the same as coal burning, and remained constant.…”

Section: Major Source Of Haze Pm In Different Regionsmentioning

confidence: 99%

Research Progress of HP Characteristics, Hazards, Control Technologies, and Measures in China after 2013

Wei

Wang

2019

Atmosphere

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In recent years, hazy weather (hazy weather (HW) has frequently invaded peoples’ lives in China, resulting in the disturbance of social operation, so it is urgent to resolve the haze pollution (HP) problem. A comprehensive understanding of HP is essential to further effectively alleviate or even eliminate it. In this study, HP characteristics in China, after 2013, were presented. It was found that the situation of HP is getting better year by year while it has been a pattern of high levels in the north and low levels in the south. In most regions of China, the contribution of a secondary source for HP is relatively large, and that of traffic is greater in the regions with rapid economic development. Hazards of HP were then summarized. Not only does HP cause harm to human health, but it also has effects on human production and quality of life, furthermore, property and atmospheric environment cannot be ignored. Next, the source and non-source control technologies of HP were first reviewed to recognize the weakness of HP control in China. This review provides more systematic information about HP problems and the future development directions of HP research were proposed to further effectively control HP in China.

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Approaches for identifying PM2.5 source types and source areas at a remote background site of South China in spring

Cited by 24 publications

References 47 publications

Transport Pathways and Potential Source Region Contributions of PM2.5 in Weifang: Seasonal Variations

Transport Pathways and Potential Source Region Contributions of PM2.5 in Weifang: Seasonal Variations

Levels, Sources and Toxicity Risks of Polycyclic Aromatic Hydrocarbons at an Island Site in the Gulf of Tonkin

Research Progress of HP Characteristics, Hazards, Control Technologies, and Measures in China after 2013

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