Despite sitting atop the world's second-largest natural gas reserves, energy shortages have become a feature of winters in Iran. Iran grapples with air pollution all year, but air quality significantly worsens during winter when power plants are forced to burn low-quality heavy fuel oil -- mazut -- to compensate for the lack of gas. A rare cold snap in recent weeks has exposed the extent of Iran's struggles to meet the rising demand for gas, with school classes forced to go online and government offices ordered shut to conserve energy. Highlighting…
