Acid rain is the rain caused by pollutants such as Nitric acid gets mixed with atmospheric vapours, a rain cloud is produced that has its acidic level lower than that of normal rain,i.e., 1 or 2 pH as compared to 5.6 pH level and it also causes harmful skin diseases for humans such as skin cancer, rashes and many diseases in plants. Acidic rain, when mixed with water bodies and streams, rivers severely affect the marine animals and can even cause their death.