Microorganisms in the Air

The atmosphere contains biological particles such as pollen, fungal spores, bacteria, viruses, and cell fragments; some can remain viable and travel as bioaerosols. Wind can transport some microorganisms over long distances, often attached to dust. Sneezing generates droplets and aerosols for nearer-range transmission; rain usually removes particles from the air, although raindrop impacts can resuspend biological material from surfaces. Distance and survival depend on the microorganism, particle size, and weather.