everywhere in the country, but in pittsburgh, they're more stark. >> there's two cities happening here. yeah. ♪ while black communities in pittsburgh deal with huge racial disparities and quickly gentrifying neighborhoods, predominantly black black neighborhoods like braddock, just outside of the city, are grappling with a common experience for black people in cities across the entire nation. the compound effects of industrial pollution and long term systemic white supremacy. >> this is the town that steel built. this is where mostly a lot of the black folks lived back in the day, but all of this area was occupied. and this is the steel mill. so they literally just worked right there. >> i can see smoke coming out of there. >> they say it's steam. >> i've heard that before. >> yeah, so, folks used to live on top of it.