Effects of day-of-week trends and vehicle types on PM2.5-bounded carbonaceous compositions

Pongpiachan, Siwatt; Kositanont, Charnwit; Palakun, Jittree; Liu, Suixin; Ho, Kin Fai; Cao, Junji

doi:10.1016/j.scitotenv.2015.06.046

Cited by 52 publications

(20 citation statements)

References 41 publications

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“…Thirdly, the number of motor vehicles, private vehicles in particular, has increased dramatically in recent years. As many studies have suggested, vehicular emissions include the main components of PM 2.5 , such as particles or the precursor gases [46,47,48]. Through this paper, we also found the significant impact from vehicles on PMAE, based on statistical information.…”

Section: Discussionsupporting

confidence: 55%

Socioeconomic Drivers of PM2.5 in the Accumulation Phase of Air Pollution Episodes in the Yangtze River Delta of China

Cai-rong

Liu

et al. 2016

IJERPH

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Recent studies in PM2.5 sources show that anthropogenic emissions are the main contributors to haze pollution. Due to their essential roles in establishing policies for improving air quality, socioeconomic drivers of PM2.5 levels have attracted increasing attention. Unlike previous studies focusing on the annual PM2.5 concentration (Cyear), this paper focuses on the accumulation phase of PM2.5 during the pollution episode (PMAE) in the Yangtze River Delta in China. This paper mainly explores the spatial variations of PMAE and its links to the socioeconomic factors using a geographical detector and simple linear regression. The results indicated that PM2.5 was more likely to accumulate in more developed cities, such as Nanjing and Shanghai. Compared with Cyear, PMAE was more sensitive to socioeconomic impacts. Among the twelve indicators chosen for this study, population density was an especially critical factor that could affect the accumulation of PM2.5 dramatically and accounted for the regional difference. A 1% increase in population density could cause a 0.167% rise in the maximal increment and a 0.214% rise in the daily increase rate of PM2.5. Additionally, industry, energy consumption, and vehicles were also significantly associated with PM2.5 accumulation. These conclusions could serve to remediate the severe PM2.5 pollution in China.

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Section: Discussionsupporting

confidence: 55%

Socioeconomic Drivers of PM2.5 in the Accumulation Phase of Air Pollution Episodes in the Yangtze River Delta of China

Cai-rong

Liu

et al. 2016

IJERPH

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“…The direct burning of agriculture crop residue in the open field has been considered as an important source of atmospheric pollution by now with significant impacts on atmospheric chemistry and global climate change and with great threat to human health (Brühl et al 2015;Pongpiachan et al 2015 andUdeigwe et al 2015). Among these series of atmospheric pollutants, CO 2 emission which primarily leads to global warming was mostly focused on fossil fuel combustion by past (Streets et al 2001).…”

Section: Introductionmentioning

confidence: 99%

culture conditions for production of cellulase by Aspergillus tubingensis KY615746 using rice straw waste

El-Nahrawy

Metwally

El-Kodoos

et al. 2017

EBSS

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TWENTY isolates of cellulase producing fungi were isolated from six samples of rotted rice straw which collected from different localities in El-Gharbia Governorate (Basyion), Kafrelsheikh Governorate (Sakha) and El-Dakahlia Governorate (El-Mansoura). On the basis of hydrolysis zone surrounding the colonies, an efficient fungus isolate (F7) for highest cellulolytic activity were chosen. According to morphological and biochemical characteristics as well as 18S rRNA sequence indicated that the isolate belonged to Aspergillus tubingensis KY615746. Effect of culture conditions for production of cellulase enzyme by A. tubingensis were investigated under Submerged Fermentation (SMF) and Solid State Fermentation (SSF) techniques. The optimum conditions for cellulase production by A. tubingensis were the best inoculum size was found to be 3%, pH 4, temperature 30 °C and incubation period 6th day where the reducing sugars attained (0.675, 0.728, 0.731 and 0.913 mg ml -1 ) with maximum activity (0.050, 0.055, 0.053 and 0.063 U ml -1 ), respectively for SMF conditions.On the other hand, the maximum cellulase activity under SSF technique with moisture level 10g : 30ml were (0.16 Ug -), incubation period 9 th day, inoculum size 4 ml:10g, pH 5 and temperature 30 °C where the reducing sugars were (1.412, 1.532, 1.551 and 1.521 mg g -1 ) with maximum activity (0.20, 0.22, 0.23 and 0.23 Ug -1 ), respectively. Based on the results, it may be concluded that rice straw waste can be a potential substrate for produce cellulase by SSF technique.

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“…The similar decreasing sequence of selected metals between the two episodes highlights the relatively homogeneous distribution of the 31 target compounds throughout the ambient air of Bangkok during the observation periods. Since previous studies report that vehicle exhaust is the main emission source of air pollutants in Bangkok (Pongpiachan, 2013b;Pongpiachan and Iijima, 2016;Pongpiachan et al, 2013Pongpiachan et al, , 2015a Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 20 March 2018 doi:10.20944/preprints201803.0171.v1…”

Section: Resultsmentioning

confidence: 99%

“…Over the last few decades there has been increasing interest in the adverse public health impacts of exposure to ambient toxic chemicals, principally in relation to carcinogenicity and mutagenicity (Pongpiachan, 2013a,b;Pongpiachan et al, 2013Pongpiachan et al, , 2015aPongpiachan et al, ,b, 2017a. Another central concern of ambient air quality studies is the chemical compositions of particulate metals.…”

Section: Introductionmentioning

confidence: 99%

“…The literature also highlights the impacts of firework displays as one of the main contributors of specific metal particulates in ambient air (Feng et al, 2016;Tsai et al, 2012;Wang et al, 2007). Despite several investigations highlighting the importance of traffic emissions as a source of chemical pollutants in Bangkok (Pongpiachan, 2013b;Pongpiachan et al, 2013Pongpiachan et al, , 2015aPongpiachan et al, , 2017b, there is no research on the effects of the "Loy Krathong Festival" (LKF) on the increase of selected metals in ambient air. It is a tradition for Thai people to float Krathongs (i.e., floating baskets) on a river, to pay respect to the spirit of the Thai river goddess or Phra Mae Kongkha.…”

Section: Introductionmentioning

confidence: 99%

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Hazard Quotients, Hazard Indexes, and Cancer Risks of Toxic Metals in PM<sub>10</sub> during Firework Displays

Pongpiachan¹,

Iijima²,

Cao³

2018

Preprint

Self Cite

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Bonfire night is a worldwide phenomenon given to numerous annual celebrations characterised by bonfires and fireworks. Since Thailand has no national ambient air quality standards for metal particulates, it is important to investigate the impacts of particulate injections on elevations of air pollutants and ecological health impacts resulting from firework displays. In this investigation, Pb and Ba were considered potential firework tracers because their concentrations were significantly higher during the episode and lower than/comparable with minimum detection limits during other periods, indicating that their elevated concentrations were principally due to pyrotechnic displays. Pb/Ca, Pb/Al, Pb/Mg, and Pb/Cu can be used to pin-point emissions from firework displays. Air mass backward trajectories (72 h) from the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model indicated that areas east and north-east of the study site were the main sources for the air transportation. Although the combined risk associated with levels of Pb, Cr, Co, Ni, Zn, As, Cd, V, and Mn was far below the standards mentioned in international guidelines, the lifetime cancer risks associated with As and Cr levels exceeded US-EPA guidelines, and may expose inhabitants of surrounding areas of Bangkok to elevated cancer risk.

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Effects of day-of-week trends and vehicle types on PM2.5-bounded carbonaceous compositions

Cited by 52 publications

References 41 publications

Socioeconomic Drivers of PM2.5 in the Accumulation Phase of Air Pollution Episodes in the Yangtze River Delta of China

Socioeconomic Drivers of PM2.5 in the Accumulation Phase of Air Pollution Episodes in the Yangtze River Delta of China

culture conditions for production of cellulase by Aspergillus tubingensis KY615746 using rice straw waste

Hazard Quotients, Hazard Indexes, and Cancer Risks of Toxic Metals in PM<sub>10</sub> during Firework Displays

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