Taj Mahal is India’s famous historical monument which is located in Agra. It has become a matter of concern to protect Taj Mahal due to the discoloration of its white marble. This is caused due to air pollution in Agra. The industries which are located in and around Agra such as Mathura Oil refinery, rubber processing, automobile and chemical industries have been responsible for the emission of air pollutants. These pollutants include Sulphur dioxide and nitrogen dioxide which reacts with water vapors in the atmosphere to form sulphuric acid and nitric acid. These acids combine with rain and makes the rain water acidic. Acid rain corrodes the marble of Taj Mahal. The suspended particles emitted by these industries have also contributed towards the yellowing of the marble.