https://cdnph.upi.com/ph/st/th/2061776896681/2026/upi_com/5671c048ce0fc60c0f3d6182b1b4294a/v1.5/Report-Over-150-million-Americans-exposed-to-harmful-air-pollution.jpg" /> More than 152 million people in the U.S. live in areas with unhealthy levels of ozone or particle pollution, a Association report said Wednesday.