Name: Environmental Education - 1
Uploaded: 2019-07-19
Duration: 25 min 8 s
Description: In this video, we will discuss the concept and features of environmental education for the UGC net exam. Let's watch this video till the end.

Question

What is smog? Distinguish between classical and photochemical smog.

Accepted Answer

Smog is a type of air pollution this kind of visible air pollution is composed of nitrogen oxide, sulphur oxide, ozone, smoke and other particulate. Man made smog is derived from coal combustion emission, vehicular emission, industrial emission and agriculture fires.

Classical and photochemical smog are as:

Classical Smog

(London Smog)

Photochemical Smog

(Los Angeles Smog)

$1 .$ This type of smog was first observed in London $1952$ . This type of smog was observed in Los Angeles in $1950$ .

$2 .$ It is formed due to the presence of ${SO}_{2}$ and humanity in the air which combines to form $H_{2} {SO}_{4}$ for which deposits on the particulates. It is formed due to photochemical reactions taking place when the air contains ${NO}_{2}$ and hydrocarbons.

$3 .$ It involves smoke and fog. It does not involve any smoke or fog. The word smog is a misnomer here.

$4 .$ It is formed in the months of winter particularly in the morning hours when the temperature is low. It is formed in the months of summer during the afternoon when there is bright sunlight so that photochemical reactions can take place.

$5 .$ It causes bronchitis irritation i.e. problem in the lungs. It causes irritation in the eyes.

$6 .$ Since this type of smog contains ${SO}_{2}$ and carbon it is reducing in character.
As this type of smog contains $O_{3}$ and ${NO}_{2}$ it is oxidising in character.

What is smog? Distinguish between classical and photochemical smog.

Important Questions on Atmospheric Pollution

Learn and Prepare for any exam you want !