Acid rain is due to air pollution of oxides of nitrogen ($NO_{x})$ and sulphur ($SO_{x}$). Sulphar dioxide ($SO_{2}$) reacts with water moisture and forms sulphuric acid, which accounts about 70% of acid rain.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.