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Describe the threat to the beauty of the Taj Mahal. 
 
The Taj Mahal in Agra, India's most famous tourist attraction, has become a concern in the last two decades. , according to experts, is discolouring its white marble.
 So it is not only living organisms that get affected by polluted but also non-living things like buildings, monuments and statues.
The industries in and near Agra, like rubber processing, automobiles, chemicals and especially the Oil Refinery, have been responsible for creating pollutants like nitrogen dioxide and sulphur dioxide. These gases combine with the water vapour present in the atmosphere to form sulphuric acid and nitric acid. These come down with the rain, making the rain . This is called acid rain. Acid rain has resulted in the corrosion of the marble of the monument. The phenomenon is also called Marble cancer. Broken particulate matter, such as the soot particles ejected by the Mathura Oil Refinery, has donated to the  of the marble.
The Supreme Court has taken steps to save the Taj. It has ordered industries to switch to cleaner fuels like CNG ( Compressed Natural Gas) and LPG (Liquefied Petroleum Gas). Moreover, automobiles should switch to unleaded petrol in the Taj zone.