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Airborne Microplastics Detected Worldwide, Threaten Cloud Formation

5/6/2026

Summary

Scientists Detect Microplastics

J. Brahney et al. documented plastic rain in U.S. protected areas (Science 2020).
Scientists found microplastic particles in the free troposphere at Pic du Midi (2021).
Studies showed microplastics cross the Southern Hemisphere and that fiber shape affects long-distance transport (2023).
Investigators suggested airborne microplastics may influence cloud formation (2023).
Measurements indicated shortwave absorption by wildfire smoke is dominated by dark brown carbon (2023).

Summary

Scientists Map Emissions

Scientists used inverse and dispersion modelling to map global atmospheric microplastic emissions to specific deposition zones.
Indoor air in Surabaya, Indonesia, measured 0.45 particles m?³, about 30 % higher than outdoor air.
In Hamburg and Shanghai, microplastics account for roughly 5 % of PM2.5 mass, showing co-presence with fine particles.
Vertical sampling in Anyang city identified a microplastic concentration maximum at 200–300 m altitude, driven by convective transport.

Summary

Scientists Identify Brown-Carbon

Li Y. M. et al. (Science 387, 2025) report nitrogen compounds dominate global atmospheric organic aerosol absorption.
Zeng L. H. et al. (Geophys. Res. Lett. 47, e2020GL088747, 2020) measured brown-carbon levels and its direct radiative effect.
Drugé T. et al. (2022) modeled brown-carbon aerosols with ARPEGE-Climat, finding they can alter regional temperature through radiative forcing.

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Scientists Detect Microplastics

J. Brahney et al. documented plastic rain in U.S. protected areas (Science 2020).
Scientists found microplastic particles in the free troposphere at Pic du Midi (2021).
Studies showed microplastics cross the Southern Hemisphere and that fiber shape affects long-distance transport (2023).
Investigators suggested airborne microplastics may influence cloud formation (2023).
Measurements indicated shortwave absorption by wildfire smoke is dominated by dark brown carbon (2023).

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