How can you catch diseases through the air?
The air around us may appear to be clean, but carries many types of microscopic particles, such as dust, water droplets and pollen, that cannot be seen by the human eye. These particles can transport microorganisms that cause a wide range of diseases in both humans and animals.
Bacteria, viruses and fungal spores in infected solids and liquids and on surfaces can become airborne by fast moving water and wind or other physical disturbance, then remain suspended for long periods. As water droplets move through the air they evaporate and shrink, which can leave behind particles small enough to float through the air and be carried on air currents inside or outside buildings. Inside buildings they can be drawn into ventilation systems and around the sewerage and drainage system.