Tehran Is Choked by Annual Buildup of Air Pollution

http://www.nytimes.com/2013/01/07/world/middleeast/tehran-is-choked-by-annual-buildup-of-air-pollution.html?partner=rss&emc=rss

The haze occurs every year when cold air and windless days trap fumes belched out by millions of cars and hundreds of old factories.

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