It's not just asthma. Black neighborhoods are more likely to be in areas where poorly regulated industry used to be so they are closer to sites where industrial

It's not just asthma. Black neighborhoods are more likely to be in areas where poorly regulated industry used to be so they are closer to sites where industrial waste has been casually dumped in the environment. Resulting in higher incidences of various diseases and also depressed growth in personal wealth since real estate near toxic waste, highways, etc. tends to be less desirable and grows in value much slower than in nicer areas. As for asthma, a lot of that has to do with freeways being built through black neighborhoods, resulting in higher exposure to diesel exhaust, pm2.5 particulates, ozone, etc. (which both makes development of asthma more likely and also aggravates asthmatic symptoms in people who have it, leading to more health issues and hospital visits).