. . . The team’s analyses showed that deaths related to air pollution exposure in the US decreased by about 47%, dropping from about 135,000 deaths in 1990 to 71,000 in 2010. Improvements in air quality and public health in the US coincided with increased federal air quality regulations, and have taken place despite increases in population, energy and electricity use, and vehicle miles traveled between 1990 and 2010. . . .