Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?

N₂O₅ is not a common pollutant introduced into the atmosphere due to natural or human activities.
$\mathit{4}{\mathit{N}\mathit{O}}_{\mathit{2}}\mathit{+}{O}_{\mathit{2}}\mathit{\to }\mathit{2}{N}_{\mathit{2}}{O}_{\mathit{5}}$
Whereas, in atmosphere
(2) NO reacts instantly with oxygen to give NO₂.
$2NO+O_2\to 2{NO}_2$
Rate of production of NO2 is faster when nitric oxide reacts with ozone in the stratosphere.
$\underset{\left(g\right)}{NO}+\underset{\left(g\right)}{O_3}\to \underset{\left(g\right)}{{NO}_2}+\underset{\left(g\right)}{O_2}$
The irritant red haze in traffic and congested places is due to oxides of nitrogen. Higher concentrations of NO2
damage the leaves of plants and retard the rate of photosynthesis. Nitrogen dioxide is a lung irritant that can lead to an acute respiratory disease in children. It is toxic to living tissues also. Nitrogen dioxide is also harmful to various textile fibres and metals.
(3) ${\mathit{N}\mathit{H}}_{\mathit{4}}{\mathit{N}\mathit{O}}_{\mathit{3}}\stackrel{\mathit{\Delta }}{\mathit{⟶}}{N}_{\mathit{2}}O\mathit{+}\mathit{2}{H}_{\mathit{2}}O$
Side effects of NO₂ include transient dizziness, dissociation, disorientation, congestion, and weakness in the legs, and when intoxicated, accidents like tripping and falling may occur. Some fatal accidents have been reported due to asphyxia (hypoxia).
(4) Dinitrogen and nitrogen are the main constituents of air. These gases do not react with each other at a normal temperature. At high altitudes, when lightning strikes, they combine to form oxides of nitrogen. NO₂ is oxidised to nitrate ion and NO– 3 which is washed into soil. It serves as a fertiliser. In an automobile engine (at high temperature), when fossil fuel is burnt, dinitrogen and dioxygen combine to yield signifi cant quantities of nitric oxide (NO) and nitrogen dioxide (NO₂), as given below:
$\underset{\left(g\right)}{N_2}+\underset{\left(g\right)}{O_2}\stackrel{1483K}{⟶}\underset{\left(g\right)}{2NO}$