Correct Answer - B
Taj Mahal is being corroded by acid rain. Under the action plan, Taj Trapezium-an area that includes the towns of Agra, Mathura and Firozabad in Up and Bharatpur in Rajsthan-has been declared to be made pollution free by use of natrual gas of LPG in industries instead to coal or oil. CNG run vehicle are being encouraged in this region.