Acid rain occurs when sulfur dioxide in the atmosphere is oxidized in the presence of nitrogen dioxide. acid rain is an example of a.. a primary pollutant. b.. a secondary pollutant. c.. a tertiary pollutant. d.. none of the above.

The answer is b. A secondary pollutants. Secondary pollutants are formed from chemical reactions that transform primary pollutants into other substances which contaminate the environment. In this scenario the primary pollutant is sulfur dioxide, which is directly released from industrial activities. This gas reacts with water in the atmosphere to form sulfuric acid, a secondary pollutant and component of acid rain.