EVs reduce tailpipe exhaust near roads but it's worth noting that brake abrasion dust isn't going away anytime soon and it's considered very bad to breathe, possibly in the same league as diesel emission particles.[1] I guess regenerative braking on an EV reduces this somewhat.
Tire dust is also concerning.[2]
[1] https://academic.oup.com/metallomics/article/12/3/371/595624...
[2] https://pubmed.ncbi.nlm.nih.gov/22642836/