The statement above is TRUE, acid rain is a secondary pollutant.
There are two basic types of pollutants, these are primary and secondary pollutants. The primary pollutants refer to those pollutants that are directly emitted from their sources. Examples are ammonia and carbon monoxide. Secondary pollutants on the other hand refer to those pollutants that are formed from the reaction of primary pollutants in the atmosphere. An example of secondary pollutant is acid rain, which forms as a result of reaction of sulphur dioxide and nitrogen in the atmosphere.
