Since microplastics can vary widely in terms of particle composition and morphology, additional studies are still needed to better understand the ice nucleation ability of microplastics. Studies on the ice nucleation ability of microplastics formed by the breakdown of frequently used products are especially necessary as these materials may contribute significantly to the microplastic burden of the atmosphere. Furthermore, the effect of atmospheric aging by O3 or UV radiation on the ice nucleation properties of microplastics remains unstudied.