Measurement of Microplastic Release After the Use of Polypropylene Nasal Irrigation Bottles

We detected microplastics in nasal irrigation fluids, which likely originated from the repeated use of nasal irrigation bottles. The quantity of microplastics was significantly higher in samples from bottles simulating 3 months of use compared to the control samples. Therefore, we recommend the development of guidelines to regulate the duration of nasal irrigation bottle usage to reduce microplastic infiltration into the body via the sinonasal cavity.