Among the following, which one is not a major contributor to acid rains-

Park's textbook of preventive and social medicine 23rd edition. * Rain water pick up suspended impurities and gases such as CO2, N2,O2 and ammonia,. Gaseous sulphur and nitrogen oxides are emitted from powerplants. These gases react with atmospheric water,forming dilute solution of sulphuric and nitric acid.this cause acid rain.