Air pollution prematurely kills seven million people every year. In Choked, Beth Gardiner travels the world to tell the story of this modern-day plague, taking readers from the halls of power in Washington and the diesel-fogged London streets she walks with her daughter to Poland's coal heartland and India's gasping capital. In a narrative that's alive with powerful voices and personalities, she exposes the political decisions and economic forces that have kept so many of us breathing dirty air. This is a moving, up-close look at the human toll, where we meet the scientists who have transformed our understanding of pollution's effects on the body and the ordinary people fighting for a cleaner future.