2022 · Q86
Which one of the following is the most important factor for the formation of smog?
General KnowledgeGeography
- ALong winter nights
- BFormation of an 'inversion lid'
- CPresence of many air pollutant resources
- DRapid fall in temperature with increasing height above the sea level
Explanation
Smog (smoke + fog) forms when air pollutants — nitrogen oxides, volatile organic compounds and particulates from vehicles and industry — react in the atmosphere. Pollutants are the essential ingredient; inversion lids and long winter nights only help them accumulate.