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Air pollution is estimated to kill 18,000 people a day around the globe. The World Bank reported it is costing about five trillion dollars a year, and hindering the development of poorer countries. The ³ÉÈË¿ìÊÖ's Neal Razzell paints an audio explanation of how pollution affects different parts of the world. (Photo: Young woman wears a pollution mask in Shanghai, Credit: iStock)