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Supplemental Information: Microplastic Entrainment in Hail: Uncovering New Pathways for Atmospheric Pollution
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Researchers analyzed microplastics preserved inside 21 hailstones from two Texas supercell storms, detecting 283 particles representing 58 polymer types in every sample and using HYSPLIT back-trajectory modeling to trace contaminated air masses to manufacturing zones and urban centers along the U.S.–Mexico border, establishing hailstones as novel archives of atmospheric microplastic loading.
Microplastics are recognized as a ubiquitous component of atmospheric particulate pollution, yet the inflow wind distribution, transport and accretion on hailstones within severe convective storm systems remain poorly understood. This study provides the first comprehensive analysis of microplastics preserved in hailstones from two major supercell storms in Texas: Del Rio (11 April 2020) and Uvalde (28 April 2021). Twenty-one hailstones were randomly chosen, melted, filtered through Whatman 0.2µm membranes, and retained particles analyzed using Fourier-Transform Infrared (FTIR) microscopy for polymer identification and morphological characterization. Microplastics were detected in every hailstone (N = 283 particles), confirming their ubiquity in the lower troposphere. Fragments were dominant morphology (69.4%), followed by fibers (23.6%), films (6.6%), and spheres (0.4%). Fifty-eight distinct polymer species were identified, with polycarbonate (n = 87), epoxy (n = 23), and polybutadiene (n = 14) comprising the most abundant chemical classes. A Kruskal–Wallis H test (p = 0.0176) revealed statistically significant heterogeneity among hailstones, implying multiple emission sources and atmospheric transport histories. HYSPLIT back-trajectory and land-use analyses revealed that low-level inflow air masses traversed manufacturing zones along the U.S. Mexico border and urban population centers that contributed to microplastic loading within the storm systems. These findings demonstrate that convective storms effectively scavenge and archive airborne microplastics, offering a novel approach for assessing inflow air mass transport and emission patterns in the atmosphere. Hailstones represent an underutilized natural archive for evaluating emission sources, inflow air mass transport, monitoring microplastic pollution and contributing to the atmospheric microplastic body of knowledge.
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Supplemental Information: Microplastic Entrainment in Hail: Uncovering New Pathways for Atmospheric Pollution
AI summary Read the abstract
Researchers analyzed microplastics preserved inside 21 hailstones from two Texas supercell storms, finding 283 particles in every stone sampled—dominated by fragments and 58 distinct polymer types—and used HYSPLIT back-trajectories to trace contamination to manufacturing zones and urban centers swept up in storm inflow.
Microplastics in Large Hailstones from Two Central Texas Supercell Thunderstorms
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Microplastics were detected in 65 large hailstones collected from two supercell thunderstorms in Texas, suggesting that atmospheric microplastics become incorporated into precipitation during storm formation and growth. This finding demonstrates that even energetic weather systems carry microplastic signatures, confirming widespread atmospheric transport as a mechanism for depositing plastic pollution in remote and pristine environments.
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