Microplastics, explained
Microplastics, or MPs, are tiny plastic
particles less than five millimeters long and have become one of Earth's most
widespread pollutants. Like synthetic plastics, MPs are mostly made of long
chains of hydrogen and carbon atoms, formed by linking byproducts of refining
crude oil and natural gas (watch explainer). Other chemical additives
may be incorporated to modify the final product’s properties.
Primary MPs, such as
microbeads commonly found in exfoliating cosmetic products, are intentionally
manufactured to be small. Secondary MPs, like those released while washing
synthetic textiles, form from the breakdown of larger plastics and make up the
bulk of MPs in the environment (learn why plastic doesn't
biodegrade).
As of 2024, the FDA claims there is insufficient evidence that MPs pose any human health risk, though initial biochemical studies have linked them to inflammation and hormone disruption.
... Read our full explainer on microplastics here.
Also, check out ...
> Microplastics are
everywhere on Earth—even Mount Everest. (More)
> Locating where microplastics
are concentrated in the human body. (More)
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