Passengers enter a metro station at the bazaar in Tehran
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Passengers enter a metro station at the bazaar in Tehran December 8, 2010. Acute air pollution in Tehran cannot be blamed on gasoline produced in an emergency plan to foil sanctions over Iran's nuclear programme, officials said on Wednesday, instead blaming the weather and domestic heaters. A weather system has trapped air in the Iranian capital for four weeks, posing a major health risk for people with respiratory problems and pushing up hospital admissions by more than 20 percent, according to the Health Ministry. In an attempt to clear the air, several public holidays were declared and cars can now only circulate on alternate days, squeezing even more people into Tehran's buses and metro.REUTERS/Caren Firouz (IRAN - Tags: POLITICS ENVIRONMENT TRANSPORT)