Perhaps because the pollution emitted by gas-powered vehicles is now essentially nil

At the expense of many layers of defensive mechanisms which a non-trivial number of people illegally modify, and I'm curious how close to "nil" it really is.

My understanding is that, at least in the context of local polution emissions (mostly smog related?) is that the difference between emissions between electric and gas cars is dwarfed by the pollution effects of rubber and concrete particulate matter created by driving.

I'm not entirely sure how accurate my knowledge is though, it's based on a few sort of tangential comments that connected some other data points I know, and not from any one source I can cite.

Also, the impression I got was this ignores things like leaking oil, which isn't measured by my state's emissions test. So I'm not trying to make claims about overall pollution effects between gas and electric.