From the poles of the earth to Mount Everest, there is no "magic claws" to escape plastic pollution. Now, even human blood has fallen.

Scientists have detected microplastic pollution in human blood for the first time, according to a study published March 24 in Environment International. Some previous studies have found microplastics in the brain, gut, placenta of unborn babies, and in adult and infant feces, but never in blood samples.

Research suggests that the absorption route of plastic particles detected in human blood may be through mucosal contact. Of these, inhaled small particles may be absorbed and accumulated in the lungs, while most larger particles are eventually swallowed by coughing and absorbed through the intestinal epithelium.

Domestic and foreign studies define tiny plastic fragments with a diameter of less than 5 mm as microplastics. While the effects of microplastics on human health are unclear, researchers are concerned that microplastics can cause damage to human cells. Air pollution particles have previously been shown to enter the body and cause millions of premature deaths each year.

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