Walking the streets of Libby, Mont., on a hazy September day, it’s not uncommon to hear the cough of a local resident. The picturesque, blue-collar town about an hour southwest of the Canada-U.S. Border in Montana’s north was once bustling with jobs thanks to nearby vermiculite mines. The work helped line locals’ wallets with steady pay. And lined their lungs with toxic asbestos dust. Years of remediation have helped make the town of about 2,700 safe again following what government officials called the worst case of industrial poisoning of a community in American history. But residents are still struggling to rebuild after hundreds died, and approximately 2,400 have been diagnosed with asbestos-related diseases.