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Polyethylene terephthalate oligomers in indoor dust: Occurrence characteristics, exposure flux and health risk
Summary
Your household dust doesn't just contain microplastic fragments—it also carries "oligomers," smaller leftover chemical building blocks from making plastics like PET (the material in water bottles and food packaging). Researchers found these oligomers in all tested dust samples, with babies facing the highest exposure risk through breathing, and lab tests showed these compounds can trigger cell damage and stress in lung tissue. This suggests plastic pollution's health risks may extend beyond visible microplastic particles to include these smaller, less-studied byproducts—something worth monitoring as research on plastics and health continues to evolve.
As inherent byproducts and concomitant pollutants of microplastics (MPs), plastic oligomers have received scarce attention regarding their environmental occurrence and potential risks to human health, especially in indoor environments, which serve as hotspots for plastic accumulation and the microenvironment where humans spend the majority of their lifetime. Herein, the distribution characteristics of polyethylene terephthalate (PET, the most abundant MPs in indoor dust) oligomer by-products in indoor dust were investigated, the human exposure fluxes were assessed, and the toxic effects of oligomers on the human lung were explored. The concentrations of total oligomers in indoor dust ranged from 2620 to 184,000 ng/g (median: 50,000 ng/g, dominated by [TPA-EG]. Infants were identified as the population at the highest risk of oligomers exposure, with the daily intake of PET oligomers via the respiratory system was as high as 1.2 ng/kg-bw/day (median). [TPA-EG] exposure was found to induce significant oxidative stress in lung cell model. Combined with network toxicology analysis, 10 key genes including AKT1 and MAPK1 were identified as critical targets of [TPA-EG]-induced pulmonary toxicity. Overall, this study provides a new perspective for the comprehensive human risk assessment of MPs.