I believe this [0] is the article (with discussion at [1]). To cherry-pick two quotes to contextualize what I recalled:
> "Tires release 100 times the amount of volatile organic compounds as a modern tailpipe, says an analyst."
> "Moreover, tire emissions from electric vehicles are 20 percent higher than those from fossil-fuel vehicles. EVs weigh more and have greater torque, which wears out tires faster."
I'm not sure how all of this works out in the grand scheme of things, or how accurate those claims are, but I think those are issues that surely deserve more looking into.
[0] https://e360.yale.edu/features/tire-pollution-toxic-chemical...