Study: Air pollution kills 3.3 million worldwide, may double
![Study: Air pollution kills 3.3 million worldwide, may double](http://bloximages.chicago2.vip.townnews.com/tdn.com/content/tncms/assets/v3/editorial/f/6d/f6df8e85-c560-55b7-af84-c1c05536b56d/55f9b2ff0b722.image.jpg?resize=300%2C200)
WASHINGTON (AP) — Air pollution is killing 3.3 million people a year worldwide, according to a new study that includes this surprise: Farming plays a large role in smog and soot deaths in indu…