Stormwater runoff in urban areas carries a significant amount of microplastics into aquatic environments. The study looked at microplastic levels in stormwater from industrial and residential areas during rainfall events. They found that polypropylene and polyethylene were the most common types of microplastics, with small fragments being the dominant shape. The concentration of microplastics was influenced by land use and rainfall characteristics, with higher levels after dry days and during heavy rainfall. The total amount of microplastics released through stormwater runoff was much higher than from wastewater treatment plants in the same area. This shows that stormwater runoff is a major pathway for microplastics to enter aquatic environments.