Question

The full form of the secondary air pollutant PAN is
1. Peroxy Acetyl Nitrate
2. Peroxy Amine Nitrate
3. Photochemical Acetyl Nitrate
4. Photochemical Amine Nitrate

Answer 1

Correct Answer - Option 1 : Peroxy Acetyl Nitrate

Explanation:

Secondary air pollutants:

(i) Primary pollutants react with one another or with water vapour, aided and abetted by the sunlight to form entirely a new set of pollutant called the secondary pollutants.

(ii) The inportant secondary pollutants are:

• Sulphuric acid (H₂SO₄)
• Ozone (O₃)
• Formaldehydes
• PAN (Peroxy Acetyl Nitrate)
• Photochemical Smog

The Important primary air pollutants are:

• Oxide of sulphur like SO₂
• Oxide of carbon like CO₂, CO
• Oxide of Nitrogen like NO, NO₂
• Volatile organic compound, mostly hydrocarbon
• Suspended Particulate matter (SPM)
• Radioactive Compounds
• Halogen compound