Which of the following is responsible for damaging Tajmahal and other monuments near Agra ?

Taj Mahal and Acid Rain The acid around the city of Agra where the Taj Mahal is located, contains fairly high levels of sulphur and nitrogen oxides. It is mainly due to large number of industries and power plants around the area. Use of poor quality of coal kerosene and firewood as fuel for domestic purposes add upto this problem. The resulting acid rain reacts with marble. CaCO3 of Taj Mahal ( 3 2 4 4 2 2 CaCO + H SO CaSO +H O+CO -> ) causing damage to this wonderful monument is being slowly disfigured and the marble is getting discoloured and lustreless. The Government of India announced an