Categorising particles into PM2.5 and PM10 is far too narrow. This doesn't adequately account for, and perhaps doesn't even measure, nano-scale combustion produ

Categorising particles into PM2.5 and PM10 is far too narrow. This doesn't adequately account for, and perhaps doesn't even measure, nano-scale combustion products. The 2.5 in PM2.5 refers to micrometers (μm), not nanometers (nm). If you're only counting the largest particles, then yes, a lot of them are going to come from tyres. https://particleandfibretoxicology.biomedcentral.com/articles/10.1186/s12989-015-0107-3 https://particleandfibretoxicology.biomedcentral.com/article... https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6558960/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6558960/