On October 27th, 1948, the residents of Donora, PA, awoke to a thick blanket of yellow smog. That was not unusual for this mill town, but this time, the stinging air didn't lift. It burned people's eyes and throats and darkened the valley for five straight days. Before it dissipated, 20 people had died from the toxic air. Many more would have life-long repercussions. Dr. Devra Davis, environmental health expert, Donora native, and author of When Smoke Ran Like Water, https: //www.basicbooks. com/titles/devra-davis/when-smoke-ran-like-water/9780465015221/ tells us how Donora slowly awakened America's need for the Clean Air Act, and why we need it just as much today. In segment two, we join Mom's Clean Air Force to meet mothers concerned about the effects of two different sources of air pollution. In Pennsylvania, parents educate themselves and guard their children's health against chemicals associated with fracking. In Orlando, we meet a mom engineer/artist who uses her paintings as one tool to express her concern about a nearby power plant. What can we do? As individuals, our transportation choices make a big impact. Don Anair of the Union of Concerned Scientists talks electric cars, evolving attitudes about carpools and rideshares, and whether or not car ownership is worth the price of admission. Will the world find enough creative options to our 1 person/1 car/1 planet challenge?