The Silent Snowfall: Formation, Advanced High-Resolution Mass Spectrometric Analysis, and Human Health Impacts of Microplastics in Central Asia

Microplastics and nanoplastics now turn up in nearly every environmental compartment that has been sampled, yet most research has focused on marine and coastal systems. Mountainous, continental regions such as Central Asia remain poorly studied. This review follows microplastics through the Central Asian setting, from their formation to their fate in the human body. It is based on a structured search and thematic synthesis of 70 peer-reviewed sources published between 2008 and 2026. Primary particles come mainly from synthetic textiles and tire wear in fast-growing cities, while secondary particles form when mismanaged plastic waste is broken down by intense high-altitude ultraviolet radiation and repeated freeze-thaw cycles. Air currents carry these particles over long distances and deposit them on the snow and glaciers of the Tien Shan, the Pamir and the neighboring Tibetan Plateau. There they lower surface albedo and can speed up melting of the “Asian Water Tower,” releasing stored particles and their adsorbed chemicals into the Amu Darya and Syr Darya basins. Spectroscopic methods identify the polymer itself, but the mobile chemical fraction, which includes plasticizers, bisphenols and degradation oligomers, is best characterized by liquid chromatography coupled to high-resolution mass spectrometry (LC-HRMS). We describe contamination-control practice, notably the use of a delay column, and the use of the Schymanski confidence scale in non-target screening. We then summarize evidence that microplastics reach human blood, lung and placenta, that nanoplastics can cross the blood-brain barrier in experimental models, and that plastic particles have been found in carotid plaques of patients who went on to have worse cardiovascular outcomes. Proposed mechanisms include “Trojan Horse” transport of sorbed pollutants and blood-brain barrier disruption through the TLR2/MMP9 axis. We close with priorities for harmonized analytical standards, transboundary monitoring, and long-term toxicological and epidemiological work.