Characteristics of Chemical Components in Fine Particles (PM2.5) and Ultrafine Particles (PM0.1) in Hanoi, Vietnam: a Case Study in Two Seasons with Different Humidity

Huyen, Truong Thi; Yamaguchi, Ryosuke; Kurotsuchi, Yuta; Sekiguchi, Kazuhiko; Nghiem, Trung-Dung; Thủy, Nguyễn Thị Thu; Ly, Bich-Thuy

doi:10.1007/s11270-021-05108-0

Cited by 22 publications

(4 citation statements)

References 74 publications

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“…It is known that several developing countries in Asia have severe particulate matter issues including ultrafine particles (Dejchanchaiwong et al, 2020, Huyen et al, 2021Liu et al, 2018). Mask-wearing by the general public is a common practice in these countries to protect themselves from inhaling particulate matters into the lungs (Cherrie et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Investigation of Mask Efficiency for Loose-fitting Masks against Ultrafine Particles and Effect on Airway Deposition Efficiency

Lee

et al. 2022

Aerosol Air Qual. Res.

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Ultrafine particle (i.e., smaller than 100 nm) in the ambient air is a significant public health issue. The inhalation and deposition of ultrafine particles in the human airways can lead to various adverse health effects. Loose-fitting types of masks are commonly used by the general public in some developing countries for protecting against ultrafine particles in the ambient environment. This research conducted a series of laboratory chamber experiments using two sets of particle sizers and two mannequin heads to study the mask efficiency of selected loose-fitting masks. Results acquired demonstrated that the cloth mask showed a low mask efficiency against ultrafine particles with the mask efficiency generally less than 0.4. The KN95 presented a better mask efficiency among all tested masks with the mask efficiency overall larger than 0.5. In addition, the effect of mask-wearing on the change of ultrafine particle airway deposition efficiency was also investigated in this study. The ultrafine particle deposition efficiency in the airway section studied was found to decrease due to mask-wearing, and the decreases of the deposition efficiencies were similar among all loose-fitting masks tested.

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Section: Introductionmentioning

confidence: 99%

Investigation of Mask Efficiency for Loose-fitting Masks against Ultrafine Particles and Effect on Airway Deposition Efficiency

Lee

et al. 2022

Aerosol Air Qual. Res.

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“…Previously, Pereira et al 26 , characterized PM 10 in CDM, however, they warned about the formation of secondary particles in the atmosphere. Likewise, Huyen et al 41 , pointed out that fine aerosols (PM 2.5 ) that include ultrafine PM come from a significant contribution of secondary organic carbon, so the growth of these particles depends on the amount of surface water molecules present in the aerosol (associated to the relative humidity), since relative humidity exerts a different effect on the concentrations of fine and coarse particles 42 . In general, the levels of PM 2.5 and PM 10 observed in the southern spring of 2016-2018 were observed in the towns of VMT, CDM and Ate in Metropolitan Lima.…”

Section: Resultsmentioning

confidence: 99%

An exploratory analysis of PM$$_{2.5}$$/PM$$_{10}$$ ratio during spring 2016–2018 in Metropolitan Lima

Cabello-Torres,

Carbo-Bustinza,

Romero-Cabello

et al. 2024

Sci Rep

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Aerosols (PM$$_{2.5}$$ 2.5 and PM$$_{10}$$ 10 ) represent one of the most critical pollutants due to their negative effects on human health. This research analyzed the relationship of PM and its PM$$_{2.5}$$ 2.5 /PM$$_{10}$$ 10 ratios with climatic variables in the austral spring (2016–2018) in Metropolitan Lima. Overall, there was an average PM$$_{2.5}$$ 2.5 /PM$$_{10}$$ 10 ratio of 0.33 with fluctuations from 0.30 to 0.35. However, there have also been high point values that reached ratios greater than one. This situation indicates a moderate condition of contamination by particulate matter with a predominance of coarse aerosols in spring, with an increasing trend over the years. The locations Ate and Villa Maria del Triunfo, especially Ate, presented poor quality conditions. Thursdays showed outstanding pollution peaks by PM$$_{10}$$ 10 , and a decrease is visible on Sundays. On the other hand, the PM$$_{2.5}$$ 2.5 showed a similar pattern every day, including Sundays. The maximum peaks occurred in the morning and night hours. The increase in anthropogenic emissions associated with the formation of secondary aerosols has been evident, being the case of the location Campo de Marte, the one that had a significant increase in ratios PM$$_{2.5}$$ 2.5 /PM$$_{10}$$ 10 , which confirms a greater intensity of secondary formations of carbonaceous particles from industrial oil sources, vehicle exhaust, as well as aerosols from metal smelting and biomass burning. There were negative correlations of the ratios with PM$$_{10}$$ 10 , temperature, wind speed, and direction, and positive correlations with PM$$_{2.5}$$ 2.5 and relative humidity. Contour lines were successfully developed that demonstrated the interaction of climate with PM$$_{2.5}$$ 2.5 /PM$$_{10}$$ 10 ratios. This will deepen the exploration of emission sources and modeling, which allows for optimizing air quality indices to control emissions and adequately manage air quality in Metropolitan Lima.

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“…In addition, the mass concentrations by different monitoring sites have attention as follows, urban > suburban > rural. In Vietnam, many studies of PM 0.1 in Hanoi, the capital city in Vietnam, are more progressive than in other SEA cities [28,[30][31][32][33][34][35]. The results show that mass concentrations in different environments in Hanoi ranged from 1 to 17 µg/m 3 .…”

Section: Pm 01 Mass Concentration In Southeast Asia Atmospherementioning

confidence: 97%

Airborne Nanoparticles (PM0.1) in Southeast Asian Cities: A Review

Phairuang

Amin²,

Hata³

et al. 2022

Sustainability

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PM0.1 (particles with a diameter ≤ 0.1 µm), nanoparticles (NPs), or ultrafine particles (UFPs) were interchangeably used in the scientific communities. PM0.1 originated from both natural and human sources; however, PM0.1 and its effects on the environment, visibility, and human health to understanding air pollution levels, sources, and impacts in Southeast Asia (SEA) countries continue to be challenging. The concentrations of PM0.1 in most SEA countries are much worse than in western countries’ environments. A further motivation of this reviewed article is to provide a critical synthesis of the current knowledge and study of ambient PM0.1 in SEA cities. The primary influence of characteristics of PM0.1 appears to be local sources, including biomass burning and motor vehicles. Continuous monitoring of PM0.1 in mass and number concentration should be further understood. A critical review is of great importance to facilitating air pollution control policies and predicting the behavior of PM0.1 in SEA.

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Characteristics of Chemical Components in Fine Particles (PM2.5) and Ultrafine Particles (PM0.1) in Hanoi, Vietnam: a Case Study in Two Seasons with Different Humidity

Cited by 22 publications

References 74 publications

Investigation of Mask Efficiency for Loose-fitting Masks against Ultrafine Particles and Effect on Airway Deposition Efficiency

Investigation of Mask Efficiency for Loose-fitting Masks against Ultrafine Particles and Effect on Airway Deposition Efficiency

An exploratory analysis of PM$$_{2.5}$$/PM$$_{10}$$ ratio during spring 2016–2018 in Metropolitan Lima

Airborne Nanoparticles (PM0.1) in Southeast Asian Cities: A Review

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