Question

which of the following is a primary pollutant that forms sulfuric acid in the atmosphere?
ozone
nitrogen dioxide
sulfur dioxide
carbon dioxide

Explanation:

Sulfur dioxide is a primary pollutant. In the atmosphere, it can be oxidized and react with water vapor to form sulfuric acid. Ozone is a secondary pollutant. Nitrogen dioxide forms nitric - acid related compounds. Carbon dioxide is mainly associated with the greenhouse effect and not sulfuric acid formation.

Answer:

sulfur dioxide