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On 18 June, VNUHCM–University of Science (HCMUS) organised the evaluation council for a Category C university-level scientific project entitled “Estimating Atmospheric Deposition of Heavy Metals in Southern Vietnamese Megacity”. The project was led by Dr Nguyễn Lý Sỹ Phú as principal investigator, alongside team members Assoc. Prof. Tô Thị Hiền, MSc Trần Ánh Ngân, MSc Võ Thị Tâm Minh, and BSc Trần Hoàng Minh.

Urban air pollution represents a critical area of concern within environmental research. In Ho Chi Minh City, previous studies have predominantly focused on assessing the concentration of airborne pollutants, particularly suspended particulate matter, whilst the deposition of atmospheric contaminants onto land surfaces and water bodies remains insufficiently documented. To address this research gap, the project was initiated to evaluate the extent of atmospheric heavy metal deposition, thereby providing a more robust scientific foundation for assessing the ecological impacts of air pollution on urban ecosystems.

Throughout the investigation, the research team developed a tailored methodology and engineered a rainwater sampling system suitable for the climatic conditions of Ho Chi Minh City. Collected samples underwent analysis via Inductively Coupled Plasma Mass Spectrometry (ICP-MS) to determine the concentration of various metallic elements, including Zn, Mn, Cu, Cr, Ni, Pb, V, and As.

The findings indicate that heavy metal concentrations in rainwater within the surveyed area mirror characteristics typically observed in urban environments heavily influenced by vehicular traffic, industrial manufacturing, and dust-generating sources. Among these elements, Zn emerged as the predominant component across the analysed samples. In addition to pollutant concentrations, the study examined the influence of heavy rainfall in Ho Chi Minh City on the transport and total deposition load of atmospheric metals into the environment.

By integrating analytical models such as the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model and Principal Component Analysis (PCA), the researchers identified potential source groups contributing to the presence of heavy metals in rainwater. These sources encompass transport activities, industrial production, construction operations, and natural dust sources.

The outcomes of this research contribute to a broader approach in urban environmental assessment, extending beyond baseline air quality monitoring at specific times to evaluate the transfer of pollutants from the atmosphere into other environmental compartments such as soil and water. The gathered data offer a valuable reference framework for subsequent studies regarding the distribution, accumulation, and ecological consequences of heavy metals within urban environments.

In terms of academic publications, the project yielded one paper in the Q1-ranked international journal Environmental Science: Atmospheres published by the Royal Society of Chemistry, one paper in a Q2 international journal, and one research article in the Science and Technology Development Journal – Natural Sciences. Furthermore, the project supported capacity building by contributing to the academic completion of one master’s student and three undergraduate students.

The evaluation council concluded that the project successfully fulfilled the research objectives set out in the proposal, employing rigorous methodologies and delivering scientifically significant results for environmental monitoring and quality assessment; the council subsequently voted unanimously to approve the official acceptance of the project.