Mini-review of microplastics in the atmosphere and their risks to humans.

Studies of microplastics (MPs) have highlighted their ubiquity in various environments. Recently, microplastics have been observed in atmospheric fallout collected from some cities. Although the studies are limited, some researches have shown that synthetic textiles are main source of airborne microplastics, and fibers are the dominant shape of microplastics in the atmosphere. Due to their small size, airborne microplastics can be directly inhaled posing health risks to humans, particularly to industry workers. Meteorological conditions and human activities affect the distribution and deposition of airborne microplastics. Furthermore, airborne microplastics are contributors to microplastic pollution in aquatic environments. We summarized the current knowledge and provide insights into further research to better understand airborne microplastics and their risks to human.