# 7.22  How is $SO_{2}$ an air pollutant?

•  Sulphur dioxide $SO_2$ is considered an air pollutant because it readily undergoes oxidation in the atmosphere to form Sulphur trioxide $SO_3$ which then reacts with water vapour to form sulphuric acid $H_2SO_4$.  Which comes down in the form of acid rain. acid rain causes deforestation which is also not good for the environment.
• Even in low concentration of $SO_2$ causes the irritation in the eyes, respiratory problem and due to this it affects the larynx to cause breathlessness.
• Harmful for plants also, long exposure to $SO_2$ can reduce the colour of the leaves. It is because the formation of chlorophyll is affected by sulphur dioxide.

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