Air pollution still plagues nearly half of Americans. That does a number on our health / Electric vehicles also cause air pollution / Almost half of U.S. exposed to dangerous levels of air pollution: report / Nearly half of US exposed to air pollution as Trump seeks to cut climate protections / Mounds of muck, air pollution turn Perungudi toxic / Early air-pollution activists fight against city smoke / 47 million health workers and advocates call for cleaner air to curb pollution deaths / One in three people worldwide are breathing in household air pollution, researchers warn / Most people around the world are now breathing polluted air, researchers warn / Big corporations are getting away with catastrophic air pollution--putting Canadians at risk