If you are wondering where they come from, think about brake pads, tires, and the pollution already deposited on the roads. When any vehicle crosses them, whether it is electric or run by combustion engines, tiny particles of tire, asphalt, and brake pads flow in the air, waiting to get into somebody’s lungs.

References

https://www.autoevolution.com/news/fully-charged-shows-why-you-are-not-saving-the-world-by-driving-an-ev-175242.html