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Episodic Dynamics and Infiltration of Atmospheric Microplastics: A Synchronized Indoor–Outdoor Field Study in Coastal Dalian, China.
Summary
Researchers measured tiny plastic particles floating in the air both inside and outside homes in a coastal Chinese city, finding that being indoors only modestly reduces your exposure (by about 12-18%) since walls and windows aren't great barriers against these particles, especially the smallest ones. This matters because it suggests you can't fully escape airborne microplastics just by staying inside, meaning breathing them in may be a routine part of daily life regardless of where you are.
Abstract This study reports a synchronized indoor–outdoor field campaign of atmospheric microplastics (MPs) in the coastal urban setting of Dalian, China. Eight synchronized samples were collected using active TSP samplers. Nile Red fluorescence microscopy was used for screening, and 14.6% of the detected particles were verified using micro-Raman spectroscopy. Airborne microplastic concentrations were 4.17–35.28 n/m³ indoors and 5.83–45.28 n/m³ outdoors, with a bulk indoor-to-outdoor (I/O) ratio of 0.82 ± 1.07. Under a sensitivity-test configuration (excluding an episodic peak on May 8), the mean outdoor and indoor concentrations were 10.37 ± 6.25 n/m³ and 9.07 ± 6.25 n/m³, respectively, yielding an I/O ratio of 0.88 ± 0.80. Morphologically, fragments predominated in both environments. Polymer identification revealed a traffic-dominated signature mixed with residential activities, characterized by a dominance of rubber particles alongside polyethylene terephthalate (PET, 19.09%), polyurethane (PU, 4.55%), polyacrylonitrile (PAN, 3.64%), and cotton (3.64%). The results show that the closed building envelope reduced microplastic loading by 12% to 18%, demonstrating a physical attenuation effect. Furthermore, size-resolved analysis revealed size-selective infiltration, with smaller MPs (<20 μm) exhibiting higher cross-barrier permeability. Rather than attempting to establish generalized standard, this pilot study offering preliminary empirical insights into microplastic fate in the built environment, highlighting infiltration dynamics in exposure models and forming a baseline for future multi-season, multi-typology research.