5. Explain the differences between pure air and polluted air.
Differences between Pure air and Polluted air are:
| Pure Air | Polluted Air |
| It is free from various harmful gases and germs. | It contains various types of germs and impurities which are very harmful to people. |
| If inhaled, we do not get any harm to our system and stay healthy. | If inhaled, it may cause respiratory problems like asthma, etc. Not healthy for our body. |
| It contains 78%nitrogen, 21%oxygen and 0.03% carbon dioxide. | It contains harmful gases like sulfur dioxide, nitrogen dioxide and others. |