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Atmospheric microplastic deposition in an urban agglomeration: Spatiotemporal dynamics, influencing factors and ecological risks
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Researchers tracked microplastic pollution falling from the air across a major Chinese urban region (Beijing-Tianjin-Hebei) over a full year, finding that busier, wealthier, more populated areas had significantly more tiny plastic particles raining down from the sky, especially in spring. Most of these particles were tiny plastic fibers, often from synthetic textiles, small enough to potentially be inhaled, and the study found "moderate" to "high" ecological risk levels at various sites, highlighting that the air we breathe in cities is a real and measurable source of microplastic exposure that changes with location and season.
Atmosphere is a crucial medium for the global cycling of microplastics (MPs), yet the environmental fate and ecological risks of atmospheric MPs in urban agglomerations remain largely unexplored. In this study, we conducted a year-round (four seasons), high-density (33 sites) passive sampling campaign across the Beijing-Tianjin-Hebei urban agglomeration to evaluate the spatiotemporal patterns, driving factors, and ecological risks of atmospheric MP deposition. The results showed that the average deposition flux was 61.89 ± 4.21 items·m·d, with significantly higher fluxes observed in Beijing and Tianjin than in Hebei, and in spring than in summer (ANOVA with Tukey's HSD, P < 0.05). The predominant characteristics of atmospheric MPs included black (53.41%) and white (27.28%) colors, fibrous morphology (90.06%), particle sizes below 1000 μm (66.72%), and polymer compositions dominated by polyethylene terephthalate (PET, 68.35%) and rayon (RY, 18.80%), with notable subregional and seasonal variations. Regional MP flux was significantly positively correlated with GDP, road density, and population density, while altitude exhibited negative correlation. At the subregional level, wind speed was the significant driver in Hebei. Seasonally, anthropogenic-MP flux correlations emerged only in autumn and winter. Distance-based redundancy analysis (db-RDA) further identified O and humidity as significant factors associated with variation in MP characteristics. Multi-index risk assessment based on deposition flux and characteristics revealed site-specific risk spanning "moderate" to "high" risk levels, with polymer type contributing the most. Collectively, this study elucidates the spatiotemporal patterns, hierarchical drivers, and ecological risks in the Beijing-Tianjin-Hebei urban agglomeration, providing a scientific reference for risk assessment and pollution control strategies.
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Researchers collected atmospheric dustfall samples across urban Beijing and analyzed the types, distribution, and likely sources of airborne microplastics. They found that synthetic fibers from textiles and fragments from various plastic products were the dominant forms, with concentrations varying by location and proximity to pollution sources. The study provides evidence that urban atmospheric microplastic pollution is widespread and likely linked to daily human activities and industrial processes.
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Researchers monitored microplastic fallout from the atmosphere in the Chinese megacity of Wuhan over an entire year and found an average of about 83 particles landing per square meter per day. The highest concentrations fell in spring, with city centers receiving more than suburbs, and most particles were tiny fibers from textiles. This study shows that simply breathing outdoor air and living in a city exposes people to a constant rain of microplastic particles.
Assessment of suspended atmospheric microplastics in Tianjin Binhai New Area: characterization, human health risks, and correlation with weather conditions and Air Quality Index
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Researchers measured airborne microplastics in an urban area of Tianjin, China, and found them in every sample collected during autumn and winter. The particles were mostly fibers, with polyethylene terephthalate and polyethylene among the most common types, and concentrations varied with weather conditions like humidity and barometric pressure. A health risk assessment suggested that residents face measurable exposure to airborne microplastics, raising concerns about long-term inhalation risks.
Unveiling the Hidden Load: High Flux and Deposition Dynamics of Atmospheric Microplastics in the North China Plain
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Atmospheric microplastics at a southern China metropolis: Occurrence, deposition flux, exposure risk and washout effect of rainfall
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Researchers measured airborne microplastics in Guangzhou, a major city in southern China, finding them throughout the year with higher levels during the rainy season. They estimated that adults in the city inhale tens of thousands of microplastic particles annually through normal breathing. Rainfall helped wash microplastics out of the air, but it also deposited them onto surfaces where they can enter water and soil, creating another pathway for human exposure.
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