Question

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

Answer 1

b. a secondary pollutant

Explanation: Acid rain forms when primary pollutants (e.g., SO2 and NOx) react in the atmosphere to produce acidic compounds (sulfuric and nitric acids), so it is a secondary pollutant.