The Taj Mahal is turning yellow mainly due to air pollution and discoloration of marble due to oxidation of its constituents especially linked to sulphur dioxide. Taj Mahal is situated in Agra. The air in this place contains serious levels of sulphur and nitrogen oxides. This is due to the large number of power plants and industries set-up around this area. All these led to acid rain. Acid rain reacted with the marble (calcium carbonate) of Taj Mahal, has caused damage to this wonderful structure, which had attracted many people from different parts of the world.