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Microplastics in the air: Weather and polymer influences on deposition trends across a rural–urban gradient
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A study along a rural-to-urban gradient in England found that microplastic deposition rates in the atmosphere ranged from 12 to 500 particles per square meter per day, with rural woodland sites recording the highest overall deposition and weather patterns playing a larger role than urbanization alone. The results challenge the assumption that cities always have the highest airborne microplastic loads.
Atmospheric microplastics are an emerging concern, yet their deposition dynamics across different landscapes and weather conditions remain poorly understood. We investigated microplastic deposition along a rural-to-urban gradient in England, sampling Wytham Woods (rural), Summertown (suburban), and Oxford City (urban) every 2-3 days from May to July 2023. Using high-resolution μFTIR spectroscopy, we quantified 21 polymer types across four size fractions (25-50 μm, 50-75 μm, 75-100 μm, and >100 μm) and analysed their deposition patterns in relation to weather variables. Deposition rates varied from 12 to 500 particles/m2/day, with Wytham Woods recording the highest overall deposition and Oxford City exhibiting the greatest polymer diversity. The 25-50 μm size fraction dominated in all sites, comprising up to 99 % of total deposition during high-concentration events. Polymer prevalence varied by site, with polyethylene terephthalate most abundant in Wytham Woods, polyethylene in Summertown, and ethylene vinyl alcohol in Oxford City. Weather conditions influenced deposition trends. Higher atmospheric pressure suppressed deposition, while increased wind speed and winds from the northeast enhanced it. Rainfall reduced overall deposition but increased the proportion of larger microplastics (50-75 μm). These findings challenge the assumption that urban areas consistently experience the highest microplastic loads, emphasising the impact of weather patterns on microplastic dispersion and deposition. This study highlights the need for further research into long-term deposition patterns of microplastics, focusing on specific polymer types and sizes, and their relationship with short-term and seasonal weather variations across diverse landscapes.
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Atmospheric microplastic deposition rates were measured across urban, sub-urban, and rural areas of northern Germany over an extended period, finding that deposition occurred everywhere but was highest in urban zones. Fibers were the most common type, with textile and tire sources implicated as major contributors. The study demonstrates that atmospheric deposition is a significant and geographically widespread pathway for microplastics entering ecosystems far from their source.
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Researchers measured atmospheric microplastic deposition at an urban site in the Humber region of the United Kingdom over 13 months. They found a mean deposition rate of approximately 3,055 particles per square meter per day, predominantly polyethylene and nylon film-shaped particles, with no clear relationship between rainfall and deposition levels. The study also characterized microplastics across five urbanized locations, finding petroleum resin particles more prevalent in industrial and roadside zones.
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