Question

The primary air pollutant(s) is/are

• A. Sulphur dioxide
• B. Lead
• C. Ozone
• D. Sulphuric acid

Hint:

Primary pollutants are emitted directly into the atmosphere, while secondary pollutants form from reactions of primary pollutants in the atmosphere.

Answer 1

The Correct Option is A

Step 1: Understanding primary and secondary pollutants: Primary pollutants are emitted directly from sources such as industrial emissions, vehicles, and natural processes. Secondary pollutants are formed by chemical reactions of primary pollutants in the atmosphere. Step 2: Evaluating the given options: Sulphur dioxide (SO\textsubscript{2}) (Option A): It is a primary pollutant emitted directly from combustion of fossil fuels. Correct. Lead (Pb) (Option B): Lead is emitted directly from industrial processes and vehicle emissions. Correct. Ozone (Option C): Ozone is a secondary pollutant formed by photochemical reactions involving nitrogen oxides and hydrocarbons. Incorrect. Sulphuric acid (H\textsubscript{2}SO\textsubscript{4}) (Option D): It is a secondary pollutant formed from sulphur dioxide reacting with water vapor. Incorrect. Conclusion: The correct answer is options (A) and (B), as these are primary air pollutants.