Sincere reply assuming sincere question, the implication is that they are statistically much more likely to live near interstates and highways. Since historically land owned by poor 'disadvantaged groups' has been easier for state and federal governments to get their hands on.

The sentence, while poorly written, isn't saying that "health impacts don't matter for 'non-disadvantaged people'". A reading that is disingenuous.

I see. In the areas familiar to the authors, disadvantaged groups typically live closer to the source of the pollution.

Makes sense now. Thanks.