People living near busy roads can reduce their blood pressure by buying HEPA air purifiers, a study found

Offloading the burden and cost to the victims is just awful.

Easier for everyone if those "busy roads" were converted into something more human/health/environmentally friendly.

I've heard that housefresh.com is a good source of legit reviews, for anyone looking for an air purifier.

Here’s a free (except for materials ofc) DIY peer reviewed Design.

https://en.wikipedia.org/wiki/Corsi-Rosenthal_Box

It also significantly lowers COVID spread which is always nice.

Interesting. I suppose it's good to have a hepa filter indoors anyway. You don't want to know how much dust comes off your synthetic clothing and that's all microplastic you're breathing.

Or better, we remove all combustible cars from the road? And have more public transit?

No purifier needed. All the benefits!