The most significant primary gaseous pollutant found in vehicular emissions is
- ACOCorrect
- BCO₂
- CSO₂
- DO₃
Solution
Concept
Primary pollutants
Step-by-step solution
1. Vehicles emit mainly CO, hydrocarbons and NOx. 2. CO is the largest by mass.
Explanation
Incomplete combustion produces CO.
Why the other options are wrong
CO₂ is a greenhouse gas, SO₂ is mainly from fuel sulphur and O₃ is a secondary pollutant.
Shortcut
Vehicle = CO.
Correct answer: A) CO