Multiple choice

Which of the following substances is not a primary pollutant?

  1. Particulate matter

  2. Sulphur dioxide

  3. Nitrogen oxide

  4. Sulphuric acid

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Primary pollutants are pollutants which are directly injected into the atmosphere. Sulphuric acid is not a primary pollutant. It is a secondary pollutant.