This is a new usage, so it's pollution added anyway.
And in any case less than 100% total energy use will generate CO2 / particulate / other emissions
Looking at the cost in CO2 to build batteries and the associate pollution, I'm not convinced there's a gain there. I have also to see the calculation of CO2 produced by gas and coal power stations and taking into account the different losses for electricity transportation and storage to agree there's a gain on that point.
About particles, there's a thing called DPF which is really efficient - much more on that point than coal power stations.
Generating enough electricity without producing CO2 is the key point. Replacing vehicles by battery-powered electrical ones without this is pointless. Adding vehicles without this is worsening the problem.