Microplastics in indoor and outdoor environments in China: Characteristic and human exposure risk assessment

Human exposure to microplastics (MPs) has led to global health concerns, but our knowledge of the characteristics and human exposure of airborne MPs is limited. Adults may have different exposure patterns and lifestyles from other age groups. Therefore, this study aims to determine the MPs exposure among adults at various locations and during different time periods. MPs were collected and detected through passive sampling and laser direct infrared (LDIR) imaging (Agilent 8700) at five locations including: dormitory, dining hall, office, library, and outdoor; the sampling lasted for 3 months. The highest concentration of indoor MPs was detected in the dining hall (193 ± 8 MPs/m