Question

why Taj Mahal is turning black?

Answer 1

because of the factories behind the taj mahal is being destroyed... the pollution may also attack this...
so the government ordered that to use battery vehicles near taj mahal around about 15 km


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Answer 2

The Taj Mahal is turning black due to air pollution , discoloration of marble due to oxidation of it's constituents , environment neglect and wear and tear caused by the million of tourist who visited it every year.