Humans can catch some diseases simply by breathing and those are called airborne diseases.
This video covers a brief note on AIRBORNE DISEASES.

"IMPORTANT LIST OF HUMAN AIRBORNE DISEASES" is discussed in another video. Click the below link
   • IMPORTNAT LIST OF HUMAN AIR BORNE DIS...  

For MICROORGANISMS IN AIR & THEIR IMPORTANCE (brief note). Click the below link
https://www.youtube.com/watch?v=xtAaS