Story highlights Choking smog leads to dire warningsAir quality at dangerous levels(CNN) First it was Beijing. Hundreds of deaths are being blamed on the thick, hazy smog that has choked Iran's capital this month, as Iranian officials scramble for solutions to the city's ever-growing pollution crisis. Smog isn't unusual in Tehran, particularly at this time of the year. The result is a choking, thick haze that blankets the city, often obscuring the city's prominent landmarks. An Iranian woman wears mask as she walk in a street in Tehran on November 16, 2016.

Source: CNN November 17, 2016 16:26 UTC