Smoky air from Canada’s wildfires is shrouding broad swaths of the U.S. from Minnesota to New York and Kentucky. That's led to warnings to stay inside and has exacerbated health risks for people already suffering from industrial pollution. The impacts are particularly hard on poor and minority communities that are more likely to live near polluting plants and have higher rates of asthma. Detroit had the worst air quality in the U.S. on Wednesday. The Environmental Protection Agency warned residents of the mostly Black city that “everyone should stay indoors.” Chicago, In...