Nothing is as elemental, as essential to human life, as the air we breathe. Yet around the world, in rich countries and poor ones, it is quietly poisoning us. Air pollution prematurely kills seven million people every year, including more than one hundred thousand Americans. It is strongly linked to strokes, heart attacks, many kinds of cancer, dementia, and premature birth, among other ailments. In Choked, Beth Gardiner travels the world to tell...