The Taj Mahal is widely considered one of the most beautiful buildings ever created. The exquisite marble structure in Agra, India, is a mausoleum, an enduring monument to the love of a husband for his favourite wife. Nano-sized airborne particles of carbon are causing the marble surface of the Taj Mahal to slowly lose its sheen, according to a study into why the iconic monument is getting discoloured.
Acid rain corrodes the marbles of monuments. The phenomenon is also called Marble cancer. Suspended particulate matter, such as soot particles emitted by Mathura oil refinery, has contributed towards yellowing of the marble. These two are the threat to the beauty of the Taj Mahal. Taj Mahal is made up of white marble. Marble is composed of calcium carbonate. Calcium carbonate reacts with acids and thus gets corroded.