Give the meaning of the term ‘smog’. List its harmful effects.


In winters, a thick fog-like layer envelops the atmosphere. This layer is made up of smoke and fog. When smoke, containing oxides of nitrogen, combines with other air pollutants and fog, it forms smog.

Harmful effects of smog

  • It leads to diseases related to lungs (such as bronchitis, asthma, etc.).
  • It prevents the sunlight from reaching the earth; this affects the normal functioning of plants.