Question

The undesirable particles and gases in air are called_________ .

Answer 1

The undesirable particles and gases in the air are called pollutants.

• Pollutants are undesirable particles present in the air.
• It may be in the form of gas or solid.
• Solid or liquid particles in the air are called Particulate matter (PM).
• Particulate matter (PM) includes dust, dirt, soot, etc.
• Pollutant gases may include Carbon mono-oxide$\left(\mathrm{CO}\right)$, Nitrogen oxides$\left({\mathrm{NO}}_{\mathrm{x}}\right)$, Sulphur dioxide $\left({\mathrm{SO}}_2\right)$ etc
• These pollutants cause various diseases like asthma, bronchitis, etc.

Hence, The undesirable particles and gases in the air are called pollutants.