A primary pollutant is a chemical added directly to the atmosphere by natural or human activities, such as volcanic eruptions or burning fossil fuels. Sulfur dioxide is a classic example, as it is emitted directly from smokestacks. In contrast, secondary pollutants like ozone form in the air through chemical reactions between primary pollutants and sunlight. ANSWER: (C) Sulfur dioxide
Which of the following is an example of a ‘Primary Pollutant’ in the atmosphere? (A) Ozone (B) Sulfuric acid (C) Sulfur dioxide (D) PAN (Peroxyacetyl nitrate)
Share
Primary pollutants are the direct result of combustion or industrial processes. Sulfur dioxide (SO2) is released when coal or oil containing sulfur is burned. Once in the atmosphere, SO2 can react with water vapor and oxygen to form sulfuric acid, which is a secondary pollutant and a major component of acid rain. Understanding the distinction is vital for environmental regulation, as controlling primary pollutants is the only way to prevent the formation of more toxic secondary substances. Other common primary pollutants include carbon monoxide and nitrogen oxides emitted from vehicle exhausts.
Solve Staff Selection Commission SSC Previous Year Papers on TA Exam and track your accuracy level. Download the app now!
Android: https://play.google.com/store/apps/details?id=com.ta.exam
iOS: https://apps.apple.com/app/id6759824444