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Polyethylene terephthalate oligomers in indoor dust: Occurrence characteristics, exposure flux and health risk
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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.
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Microplastics in house dust from 12 countries and associated human exposure
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Researchers analyzed indoor house dust from 286 homes across 12 countries for PET and polycarbonate microplastics. They found PET-based microplastics in every sample tested, at concentrations up to 120,000 micrograms per gram, while polycarbonate was detected at lower levels. The study estimates that infants may ingest significant amounts of PET microplastics daily through dust exposure, highlighting indoor environments as an important but often overlooked source of microplastic contact.
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Researchers collected indoor and outdoor dust samples from 39 major Chinese cities and found widespread contamination with PET and polycarbonate microplastics. Indoor dust contained significantly higher concentrations than outdoor dust, suggesting that household products and furnishings are major sources. The study estimated daily human exposure levels through dust ingestion and inhalation, identifying young children as the most vulnerable group.
Small particles, large questions: unravelling the toxicity and potential health risks of PET micro-/nanoplastics
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A comprehensive literature review of PET micro- and nanoplastics found consistent evidence of human exposure, detection in human tissues, and biological effects including oxidative stress, inflammation, metabolic disruption, and genotoxicity, with smaller particles showing greater cellular uptake and biodistribution. Significant gaps in protocol harmonization and realistic exposure modeling currently prevent robust quantitative risk assessment of PET microplastic health impacts.
Microplastics in dust from different indoor environments
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Researchers measured microplastic levels in indoor dust across different types of buildings, finding that residential apartments had the highest concentrations at over 1,100 particles per gram of dust. Polyester fibers were the most common type in homes and hotels, while offices and classrooms had more polyethylene and polypropylene. The study estimated that infants face the highest daily microplastic intake from breathing indoor dust, roughly 30 times more per body weight than adults.
Harmful effects of true-to-life nanoplastics derived from PET water bottles in human alveolar macrophages.
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Researchers tested nanoplastics derived from actual PET water bottles on mouse lung immune cells, focusing specifically on cells that had internalized the particles. Even though the nanoplastics were taken up by 100% of cells at the highest dose, they did not cause outright cell death. However, they did trigger significant increases in reactive oxygen species and shifted the immune cells toward a pro-inflammatory state, suggesting that inhaled nanoplastics from everyday plastic products could promote chronic lung inflammation.
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