Car pollution isn’t likely to still be a problem in 5 years when we’re all using electric cars.
We won't even be at 50% electric in 5 years. I doubt we'll even be at 50% of cars being sold being electric in 5 years.
I wear a cheap disposable N95 mask when I walk along busy streets, which filters out probably at least 98% of the particulates. (The "95" in "N95" stands for 95%, but that is 95% of the particles that are hardest to filter: both smaller particles and larger particles are easier to filter. So since it is quite unlikely that all or most of the particles produced by brakes and tires are precisely the size that is hardest to filter, I estimate that my cheap $2 mask that can be reused for dozens walks is probably filtering at least 98%.)
In contrast noise pollution and tailpipe pollution and fuel-tank-evaporation pollution are much harder to filter (at least for pedestrians on the move) so a drastic reduction in one and a complete elimination of the other two is an extremely welcome development.
Specifically, the gaseous pollution from tailpipes and fuel tanks is composed of many hundreds of different compounds, many of which can be effectively absorbed by filtration media, but many of which cannot be. I don't bother to try to filter out this kind of pollution (i.e., gaseous) when I walk along busy streets because the filtration media makes the mask much bulkier and heavier than my N95 masks are and because the filtration media costs more (even plain activated carbon, the cheapest and most useful media for gases) and remains effective for a much shorter duration before it must be replaced.