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JOURNAL OF MATERIALS & CONSTRUCTION

ISSN: 2734-9438

Website: www.jomc.vn

Temporal Variation of Ambient PM2.5 and PM10 and Associated Non-Carcinogenic Health Risks in Thai Nguyen City, Vietnam

Bui Thi Hieu , Nguyen Khanh Long , Nguyen Duc Luong , Nguyen Thi Hue

Abstract

This study examined the monthly and seasonal variations of ambient PM2.5 and PM10 concentrations in Thai Nguyen City and quantitatively assessed the associated non-carcinogenic health risks for different population groups in 2021. The results reveal a pronounced seasonal pattern in air quality, with elevated fine particulate matter PM2.5 concentrations during the dry and cold season. Monthly average PM2.5 levels exceeded the national regulatory limit (QCVN 05:2023/BTNMT) in most months, with severe pollution episodes observed in January and December, when concentrations were more than 2.6 to over three times higher than the permissible standard. These findings indicate that PM2.5 pollution in Thai Nguyen City is persistent and seasonally intensified, driven by unfavorable meteorological conditions combined with continuous emission sources such as traffic, industrial activities, and biomass burning. In contrast, PM10 concentrations remained below regulatory limits throughout the year, suggesting that fine particulate matter is the primary air pollutant of concern. Health risk assessment results show that, under normal conditions, exposure to particulate matter poses negligible health risks for infants, children, and adults. However, under worst-case scenarios, PM2.5 exposure leads to unacceptable health risks for infants and children, with Hazard Quotient values exceeding the safety threshold, while adults remain below this threshold. Overall, PM2.5 contributes substantially more to health risks than PM10 due to its higher toxicity and deeper penetration into the respiratory system.

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