Electric cars will produce very little brake dust as they regenerative braking. In an emergency braking situation they will use friction braking but not for da

Electric cars will produce very little brake dust as they regenerative braking. In an emergency braking situation they will use friction braking but not for day to day driving. That means 90% of cars particulate matter must be coming from tyres and the road surface. How far does this travel? Does it just fall back quickly onto the road? Does it get washed away in a rain storm? Do you have a source for that 90% figure?