Airborne diseases are those, which are caused by microorganisms and spread through the air. These are mostly caused by pathogens like bacteria, fungi or viruses and are expelled into the air due to coughing, sneezing or talking.

Climatic factors such as humid conditions and persistently high temperature might also increase the risk of contracting airborne diseases. High humidity levels promote aerosol growth and deposition in the respiratory tract. On the other hand, loss of water is the greatest environmental stressor for the microorganisms to stay viable.