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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Microplastics have been detected in cloud water collected at mountain sites in Japan and China. Laboratory studies also suggest that some particles, depending on their polymer and surface condition, could take part in processes that form cloud droplets or ice. But no cited field study shows that microplastics have changed rainfall, storms, cloud lifetimes or weather patterns.
Have microplastics actually been found in clouds?
Yes. Researchers have identified plastic particles in cloud-water samples collected at specific mountain locations. These are local measurements from particular sampling periods and methods; they do not establish how widespread microplastics are in clouds globally.
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Mount Tai, China
A study published online on November 15, 2023, and in the January 2024 issue of Environmental Science & Technology Letters, analyzed 28 liquid cloud-water samples collected at Mount Tai, 1,545 meters above sea level. The study reported an average of 463 microplastic particles per liter of cloud water, corresponding to 0.21 particles per cubic meter of air. The particles measured 8 to 1,542 micrometers, and 60% were smaller than 100 micrometers. These figures describe the Mount Tai study, not a global average. Read the study.
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Mountain sites in Japan
A separate study sampled cloud water at Japanese mountain sites from 1,300 to 3,776 meters in elevation and identified nine polymer types. Its reported mean concentrations ranged from 6.7 to 13.9 pieces per liter, with particle Feret diameters of 7.1 to 94.6 micrometers. The authors found abundant hydrophilic groups on particles and suggested they might support condensation. Collection equipment differed among sites, and some methods may have trapped particles, potentially leading to underestimates. Read the study.
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The Japanese and Mount Tai measurements should not be treated as a direct comparison: the sites, sampling equipment and study methods differed, and the reported concentration ranges do not describe the same sampling conditions.
How could microplastics influence cloud formation?
Clouds form when water vapor condenses onto particles in the atmosphere, and ice can form in supercooled droplets. Atmospheric particles that help initiate these processes are known as cloud condensation nuclei (CCN) and ice-nucleating particles (INPs), respectively. If microplastics have the right properties, they could participate in one or both pathways.
Condensation depends on the particle surface
Plastic surfaces can change as they weather and interact with other materials in the environment. A 2022 perspective in Nature Geoscience proposed that environmental aging and the uptake of other substances may affect whether micro- and nanoplastics act as CCN. A Japanese field study’s finding of hydrophilic surface groups likewise points to a possible condensation role, but it does not show that the particles produced a measurable change in a cloud.
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Ice nucleation depends on polymer and weathering
A 2024 Nature Communications study tested model polyethylene particles as well as polypropylene, polystyrene and PET. In controlled experiments, the researchers linked ice-nucleating activity to polymer chemistry and sunlight-induced weathering, examining condensation and immersion-freezing behavior. This supports the plausibility of a cloud-microphysics mechanism; it does not measure how often these particles initiate ice in the open atmosphere or show an effect on weather. Read the study.
In practical terms, a particle’s polymer, size and surface condition matter. So does its abundance relative to other atmospheric aerosols. Demonstrating that a particle can affect a process in laboratory conditions is not the same as establishing that it is common or influential enough to alter clouds outside the lab.
Is there evidence that microplastics are changing the weather?
No observed weather change is established by the cited studies. They do not report a microplastic-caused change in precipitation, cloud lifetime, storms or a named climate measure. Finding particles in cloud water establishes their presence in sampled clouds; laboratory evidence establishes a possible mechanism. Neither, on its own, demonstrates a weather consequence.
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The 2022 Nature Geoscience perspective said atmospheric micro- and nanoplastic concentrations were then low and unlikely to make a substantial contribution to radiative forcing in regions that also contain natural or pollution-related aerosols. It allowed that remote or marine clouds might be perturbed, while emphasizing the need for more measurements and better characterization of particle properties. That is a qualified assessment of potential climate effects, not evidence that weather patterns have already changed. Read the perspective.
What measurements would clarify the risk?
Answering whether microplastics meaningfully affect clouds requires more than detecting them or showing that they can nucleate ice in a controlled experiment. Researchers would need to establish how many relevant particles occur in different clouds, how their surface properties change, and how often they participate in cloud processes compared with other aerosols. Those measurements could then help determine whether any microphysical effect is large enough to influence precipitation or climate.
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