Statues and monuments in India are affected by acid rain. How?

$A$ large number of industries and power plants are located around the area of the Taj Mahal. These use poor quality coal,kerosene,and firewood,which leads to a high concentration of sulphur and nitrogen oxides in the atmosphere. These oxides react with atmospheric moisture to form acid rain,which subsequently reacts with the calcium carbonate $(CaCO_3)$ present in the marble of the Taj Mahal.
$CaCO_3 + H_2SO_4 \rightarrow CaSO_4 + H_2O + CO_2$
As a result,the marble surface is slowly disfigured,becoming discoloured and losing its natural lustre.