I think it’s mostly break dust. Electric cars are heavier but can also hopefully mostly use regenerative breaking instead of break pads. Road vibrations (and wear?) tend to go as the fourth power of weight over the axle and so it tends to be worse for (naturally heavier) electric cars but even worse for goods vehicles.

But london tube have order of magnitude of dust pollution and buses damage roads (aka pollute) 30,000 (yes 30k) times more due to weight.