ArticleEnvironmental science & technology2026
Field Monitoring of Microplastics in Urban Runoff: Treatment Efficiency of Biofilters.
Article in Environmental science & technology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Authors and funding
4 authors.
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No grant is acknowledged in the PubMed record.
Abstract
This study presents the most extensive and first region-wide data set to date on microplastic (MP) treatment by stormwater biofilters (also known as biofiltration/bioretention systems), based on paired influent and effluent flow-weighted composite samples collected across seven southern California installations. MPs were quantified and characterized by five size fractions (20 μm to >500 μm), morphology, color, and polymer type. Across 18 storm events, the median MP event-mean concentration (EMC) reduction was 72%, and for the 14 events with runoff volume data, the median total MP load removal was 93%. EMC reduction was generally consistent across size fractions, ranging from 68% to 100% for different size fractions. Physical filtration (i.e., straining) was identified as the dominant removal mechanism for MPs in biofilters, supported by the close correspondence between the MPs and all particles remaining after extraction. The alignment in occurrence across a wide concentration range (linear regression R
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