In 2015, Dris et al. first detected microplastic aerosols in the atmosphere. Since then, researchers have tried to identify the sources of these aerosols. Tire wear particles from roads are thought to be one of the most significant sources of plastics to the atmosphere, followed by microplastics ejected to the atmosphere with sea spray aerosol and agricultural soil dust. Additionally, microplastics originating from the breakdown of frequently used commercial products, such as polyester clothing, can contribute to the release of plastic fibers into the atmosphere. Recent studies showed the pivotal role of the atmosphere as a transport system for microplastics connecting natural and urban systems. As microplastics get transported throughout the atmosphere, aging is induced by exposure to ultraviolet (UV) radiation and oxidants, such as ozone (O3). This aging process can oxidize the surface and bulk of microplastics, changing the hydrophobicity/hydrophilicity and chemical properties of the particles. Such changes will likely modify the ability of microplastics to nucleate ice.