Dhaka, Jan. 30 -- When a city holds the unenviable record of remaining at the top of the list of the most polluted cities in the world for an entire week except a day, the gravity of the problem paints a bleak picture for its citizens. If this is not enough cause for concern, another study finding that the city is mired with heavy pollution for 317 days out of 365 days of a year certainly exposes the nightmarish living condition in that urban conundrum. Well, the city concerned is none other than Dhaka, the capital of Bangladesh. Narayanganj, Gazipur and Savar are also turning dangerous for air pollution. Usually, Dhaka and New Delhi wrest the dubious title of the air pollution competition from each other but at times a few Chinese cities...