Question

Explain the differences between pure air and polluted air.

Answer 1

The differences between pure air and polluted air are as follows:

PURE AIR	POLLUTED AIR
Pure air has a mixture of gases in a definite ratio which is good for living beings.	Polluted air has contaminated substances and harmful pollutants.
The volume of major gases present in pure air is, Nitrogen(78%), Oxygen(21%), Carbon dioxide(0.03%)	Polluted air has no such definite composition of these gases.
Other gases present in the pure air are:- Argon(Ar), Methane$\left({\mathrm{CH}}_4\right)$, Ozone$\left({\mathrm{O}}_3\right)$ , Water vapours	The gases present in the polluted air are:- Sulphur dioxide$\left({\mathrm{SO}}_2\right)$, Nitrogen dioxide$\left({\mathrm{NO}}_2\right)$, Carbon monoxide$\left(\mathrm{CO}\right)$, particulate matter, etc.
Pure air is always refreshing to us and keeps us fresh.	This type of air also contains bacteria or viruses which are harmful, hence are not refreshing
Pure air is very safe to breathe.	Polluted air is not at all good for breathing, it causes respiratory diseases.

The pure air is the mixture of gases in a definite ratio which is good for living beings and the polluted air has no such definite ratio of these gases.