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without greenhouse effect our earth’s reddish brown in colour and NO is a
temperature would not have been colourless and an odourless gas. Nitrogen
sustainable to live in but if this effect gets dioxide and nitrogen oxide are released into
pronounced due to the increased atmosphere by vehicular emissions,
concentration of greenhouse gases then for industrial sources and through incomplete
sure it is a matter of concern because it can combustion of fossil fuels like coal, crude oil
lead to global warming. Global warming is and natural gas. Nitrogen oxide as such is not
thus the outcome of enhanced greenhouse hazardous in the appropriate concentration
but nitrogen dioxide can lead to several
different environmental impacts such as
formation of photochemical smog and acid
rain.
Effects :
(a) Photochemical smog : Smog is derived
from two words as “smoke” and “fog”
photochemical smog is formed due to
the action of sunlight on hydrocarbons
and nitrogen oxides (NO)x.
Hydrocarbon + (NO)x + Sunlight ¾¾®
Photochemical smog
Greenhouse effect
Photochemical smog causes irritation in
eyes, decreased immunity and less
Photochemical smog
Global warming : causes and effects
visiblility due to haze formation.
effect.
(b) Acid rain : When excessive amount of
Oxides of nitrogen : There are a large nitrogen oxides and sulphur oxides gets
number of oxides of nitrogen but only two absorbed in the atmosphere, they
are considered to be pollutants - nitric oxide combine with falling rainwater so as to
(NO) and nitrogen dioxide (NO ). NO is a
2 2 form sulphuric and nitric acid. This rain
suffocating gas having a pungent smell. It is carrying these acids is called “acid rain”.
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