Question

What is the difference between classical smog and photochemical smog?

Answer 1

Classical smog

1. This type of smog is formed due to high concentration of SO2 and particulate matter produced from fuel combination.

2. It is reducing in nature.

3. It occurs in cool, humid climate.

4. It can cause irritation, bronchitis and lung problem.

Photochemical smog

1. This type of smog is formed due to the action of sunlight on nitrogen oxides and hydrocarbons produced by factories or automobiles.

2. It is oxidising in nature.

3. It occurs in warm, dry and sunny climate.

4. It causes irritation to the eyes.

Classical smog is also called London-type smog which occurs in the regions where emission of the sulphur containing compounds is high (e.g., due to burning of coal)  and air contains high liquid water contents (e.g., fogs). The main components of classical fog are smoke, fog, sulphur dioxide.

Photochemical smog is also called Los-Angeles-type smog which occurs in the regions where there is high emissions of automobiles, large concentrations of reactive hydrocarbons (RH) (from automobile) and plenty of sunlight (high level of UV radiation).

Answer 2

Answer:  Explanation:                CLASSICAL SMOG                     |                      PHOTOCHEMICAL SMOG 1.>  This smog was observed in London  |    1.>  This smog was observed in Los Angeles in 1952 for fist time.                                   |     in 1950 for the first time. 2.>  It is formed due to the presence of   |    2.>  It is formed when air contain NO2 and SO2 and humidity in air which combine  |     hydrocarbons. to form H2SO4.                                          | 3.>  It is formed in winter.                          |     3.>  It is formed in summer. 4.>  It cause problem in lungs.                  |     4.>  It cause irritation in eyes. 5.>  It is reducing in character.                  |     5.>  It is oxidizing in nature.