I teach medical students that "what you breathe" is part of your metabolic environment.

A Science Advances paper quantified microplastics AND nanoplastics in the air of two megacities—down to 200 nm.

In total suspended particles (TSP), they measured:
• ~1.4–1.8 × 10^5 microplastic particles per m³
• ~3.0–4.2 × 10^4 nanoplastic particles per m³

And road-dust resuspension looked like a...
#microplastics #environmentalhealth #mitochondria #metabolichealth #longevity
https://www.science.org/doi/10.1126/sciadv.adz7779