And the number of cars on the roads >The relative contribution of tyre wear and tear to the total global amount of plastics ending up in our oceans is estimate

And the number of cars on the roads >The relative contribution of tyre wear and tear to the total global amount of plastics ending up in our oceans is estimated to be 5–10%. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5664766/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5664766/