Final answer:
TB (Tuberculosis), mumps, and rubella are diseases that can be transmitted through the air when an infected person coughs or sneezes. Nearby individuals can inhale the pathogens and become new hosts for the diseases.
Step-by-step explanation:
The diseases whose mode of transmission is through the air include TB (Tuberculosis), mumps, and rubella. These diseases can be spread when pathogens in droplets are expelled from an infected person's respiratory system during coughing or sneezing. Nearby individuals can inhale these pathogens and become new hosts for the diseases.