The Taj Mahal is turning yellow because of air pollution, blemishing of marble, environmental neglect and wear and tear as millions of tourists visit Agra to view it every year. Moreover, since Taj Mahal is a centuries-old monument, discoloring of marble is a normal phenomenon as marble used in building Taj Mahal consists of several minerals, which get oxidized over time. Another cause that can be attributed for the deterioration of the monument is rain.
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