HYDERABAD: Hyderabad woke up to a blanket of smoke on Monday, a day after Diwali celebrations, as extensive firecracker bursting pushed air pollution levels to. Thick smog and the smell of burnt chemicals and sulphur lingered in several areas, including Serilingampally, Begumpet, Kompally, Jeedimetla and Sanathnagar, even after the celebrations ended.The pollution levels were considerably higher than those recorded after Diwali last year.