________ keep our body strong and fit.

When air moves fast it is called

We should  keep  our doors  and  windows

Impure air  harms

While  sleeping  we should  keep our face

Air has

 The ___________ from factories  and vehicles  makes  the air impure.

We  must breathe  _________for health.

Air contains  _________ particles.

When air moves gently it is called