Question

The combination of tropospheric ozone, smoke and fog produces

___ .

Answer 1

Smog is a mixture formed by a combination of smoke, fog and tropospheric ozone in the presence of sunlight. Vehicular exhausts, burning of agricultural crops, coal emissions, and even the products obtained by the reaction between nitrogen oxides and sunlight are common causes of smog in major cities like Delhi, Beijing, Los Angeles, Tehran, etc.