The influence of road vehicle tyre wear on microplastics in a high-traffic university for sustainable transportation.

Road-associated microplastics, originating from tire wear and fragmented litter, are significant contributors to microplastic pollution. This study examines the characteristics of these particles within a university, focusing on their size, shape, color, and polymer composition. Suspended microplastics were collected using portable active samplers for PM and results have shown that PM concentrations peaked on Thursdays and declined, reaching their lowest levels on Sundays, with overall weekend measurements indicating reduced concentrations compared to weekdays. Importantly, the presence of microplastics correlated with increased PM10 levels. These findings highlighted a dominance of irregularly fragmented black microplastics, primarily composed of polyethylene, polypropylene, and polybutadiene, influenced mainly by vehicular movement. Additionally, metal contaminants such as aluminum, iron, and zinc were identified through SEM-EDX analysis of selected microplastics, particularly concentrated at the university's main entrance, the area with the highest traffic. This research enhances understanding of atmospheric microplastic pollution in university environments with heavy vehicle traffic and supports efforts to promote sustainable transportation and climate-friendly initiatives.