Explain tropospheric pollution in 100 words.
Tropospheric pollution arises due to the presence of
undesirable substances in the lowest layer of the
Oxides of sulphur, nitrogen, carbon, and hydrocarbons are the
major gaseous pollutants.
Oxides of sulphur
SO3) and nitrogen
(NO2, NO) are produced as a
result of burning of fossil fuels (coal, automobile fuel). These
oxides react with water in the presence of atmospheric oxygen to
form nitric acid (HNO3) and
which leads to the formation of
Acid rain causes harm to agriculture, plants, and trees. It
also leads to various respiratory ailments.
Hydrocarbons are carbon and hydrogen
containing compounds that burn to produce oxides of carbon.
Hydrocarbons are carcinogenic and their products are also major
pollutants. Carbon monoxide (CO) is poisonous in nature as it
reacts with the haemoglobin of blood, which can even result in
death. Though carbon dioxide
(CO2) is not toxic in
nature, yet it contributes towards global warming by trapping the
reflected IR rays. This results in the heating up of the
atmosphere, thereby leading to the melting of icebergs and
Particulates of smoke, dust, mist, and fume are harmful for human
health as they are likely to block the nasal passage of a person,
causing respiratory ailments. Smoke and fog combine to produce
smog during a cool, humid day, thereby reducing visibility to a
large extent. Photochemical smog is formed due to the presence of
PAN, ozone, formaldehyde, and acrolein. It causes eye irritation,
headaches, and chest pain. It also leads to the cracking of
rubber and does damage to plants.
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