Hurricane Harvey picked up and spread around scores of toxic chemicals in Houston, home to 6.5 million residents and 500 industrial sites—drawing attention to chemical-related health risks new and old.Oil refineries, hazardous waste sites and abandoned Superfund sites…

When a rash of cancer cases hit the bucolic agricultural region of Campania, Italy, investigators eventually traced the rising rates to illegal dumping of toxic waste. An Italian National Institute of Health inquiry showed a 17% rise in cancers of the central nervous…