Origins and architecture of the Taj Mahal older, pre-Mughal methods of proportion were employed as ordering principles in the Taj. The focus and climax of the Taj Mahal complex is the symmetrical white marble tomb; a cubic building with chamfered corners, with arched recesses known as pishtaqs. It is topped by a large dome and several pillared, roofed chhatris. In plan, it has a near perfect symmetry about 4 axes. It comprises 4 floors; the lower basement storey containing the tombs of Jahan and Mumtaz, the entrance storey containing identical cenotaphs of the tombs below in a much more elaborate chamber, an ambulatory storey and a roof
Taj Mahal the government erected scaffolding to disguise the building in anticipation of air attacks by the Japanese Air Force. During the India-Pakistan wars of 1965 and 1971, scaffolding was again erected to mislead bomber pilots. More recent threats have come from environmental pollution on the banks of the Yamuna River including acid rain due to the Mathura Oil Refinery, which was opposed by Supreme Court of India directives. The pollution has been turning the Taj Mahal yellow. To help control the pollution, the Indian government has set up the Taj Trapezium Zone (TTZ), a area around the monument where strict emissions