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When the cold season hits Bangladesh in November-February every winter, the skies in Dhaka, Chattogram, Narayanganj, Gazipur and other large cities of the country appear perfectly familiar and at the same time terribly threatening. The cityscape is regularly blanketed with a heavy and gray blanket. It might seem to the careless eye an air of mist or fog, but this haze of seasonal fog is much darker. It is smog, a heavy layer of air pollutants that suffocates millions of peopl