The word smog is combination
of smoke and fog. At least two
distinct types of smog are recognized: Classical smog and photochemical smog.
Classical smog is also known as sulfurous smog or London smog. Sulfurous smog,
which results from a high concentration of sulfur oxides in the air and is
caused by the use of sulfur-bearing fossil fuels, particularly coal.
Photochemical
smog: This
type of smog was observed in Los Angeles(1940s) and hence named as Los Angeles
smog. It is formed when the air contains NO2 and hydrocarbons and the mixture
is exposed to sunlight. As the reaction take place in the presence of light to
form the smog, it is called photochemical smog.
London Smog vs Los Angeles Smog (Main constituents and chemistry)
Classical Smog vs Photochemical Smog
Classical Smog vs Photochemical Smog
London smog
or
Classical smog
|
Los Angeles smog
or
Photochemical smog
|
This
type of smog is first observed in 1952 in London.
|
This
type of smog was first observed in 1943
in Los Angeles.
|
It
involves smoke and fog (smog)
|
The
word smog is misnomer here as it does not involve any smoke or fog.
|
It is
formed due to presence of SO2 and humidity in the air which
combine to form H2SO4 (Sulphuric acid) fog which
deposits on the particulates. Therefore London smog is also known as Sulfurous smog
|
It is
formed due to photochemical reaction (presence of sunlight) taking place when
air contains NO2 and hydrocarbons forming toxic chemicals like
peroxyacylnitrates (PAN), Ozone etc..
Los Angeles smog is also known as Photochemical smog. |
It is
reducing* in character. Chemically it is reducing mixture and hence is called reducing smog.
|
It is
oxidizing* in character. It has high concentration of oxidizing agents hence
it is known as oxidizing smog.
|
It
causes bronchitis irritation, i.e., problem
in the lungs.
|
It
causes irritation in the eyes.
|
It is
formed in the months of winter particularly in the morning hours when temperature
is low.
|
It is
formed in the months of summer during afternoon when there is bright sunlight
so that photochemical reactions can take place.
|
*Reduction:
in simple terms addition of hydrogen
|
*Oxidation:
addition of oxygen
|
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ReplyDeleteThanks very helpful! I found nothing about this in Ukrainian so i just translated..
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