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Asansol is a city in the Indian state of West Bengal. It is the second largest and one of the most populated cities of West Bengal. It is the 33rd largest urban agglomeration in India by population. Asansol is the district headquarters of Paschim Bardhaman district. According to a 2010 report released by the International Institute for Environment and Development, a UK-based policy research non-governmental body, Asansol was ranked 11th among Indian cities and 42nd in the world in its list of 100 fastest-growing cities. Asansol is classed as a Y-category city for calculation of HRA for public servants making it a "Tier-II" city.