• # question_answer Why is acid rain considered as a threat to Taj Mahal?

Taj Mahal is made of marble. The acid rain contains ${{H}_{2}}S{{O}_{4}}$ which attacks the marble $(CaC{{O}_{3}})$ thereby pitting it, discolouring it and making it lustreless. $CaC{{O}_{3}}+{{H}_{2}}S{{O}_{4}}\xrightarrow{\,}\,CaS{{O}_{4}}+C{{O}_{2}}+{{H}_{2}}O$