[savagedata]

They approximated income, education, and ethnicity at the neighborhood-level (400-600 people) based on census data. That doesn't seem granular enough to me if the poorest families in each neighborhood live closest to the major roads.

[madaxe_again]

I’ve seen similar studies done in the U.K., where in cities plenty of relatively affluent people live directly on very congested, polluted roads, and the findings were identical. IIRC they found the worst effects were on people who had been living there for 40+ years - and speculated that that was down to lead exposure until TEL was banned - however the impacts of contemporary pollutants was still significant.