A number of cities and towns in the East and North East United States are under air quality warnings Wednesday because of wildfires in Canada. Dr. Neela Tummala talks about the health risks associated with poor air quality. And, who will pay to clean dangerous PFAS chemicals out of our water supplies? One settlement and one pending case might provide some clues. Grist reporter Zoya Teirstein explains. Then, Nam June Paik's been called the "father of video art." And he was — but he was so much more. Sixteen years after his death, a new documentary, "Moon is the Oldest TV," examines his life through newsreels, interviews, video clips and recordings. Filmmaker Amanda Kim joins us.