Outdoor air pollution was responsible for an estimated 4.2 million deaths worldwide in 2015, according to medical journal The Lancet medical journal. That fine pollution, according to the New York Times often comes from burning things like coal, gasoline, woody materials and other materials that burn during wildfires. Richard Peltier is an associate professor of Environmental Health Sciences at the UMass Amherst. Peltier focuses on how air pollution impacts human health. Carrie Saldo asked him for his reaction to the Times reporting and what it means for western Mass air quality.