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Bioaerosols are airborne particles that are biological in origin. Bioaerosols can be formed from nearly any process that involves biological materials and generates enough energy to separate small particles from the larger substance, such as wind, water, air, or mechanical movement. Plants, soil, water, and animals (including humans) all serve as sources of bioaerosols, and bioaerosols are subsequently present in most places where any of these sources live. Given that these sources are ubiquitous in nature, it can be said that bioaerosols are just about everywhere!

Figure 1: Aerosolized fungal spores.

Bioaerosols have a direct effect on our world on a daily basis, causing many health and welfare effects. The health hazards associated with bioaerosols can range from more mild reactions such as allergies to much more severe reactions, such as death caused by airborne pathogens. Welfare effects range from crop and livestock damage to lost tourism dollars and beyond.