Airborne particles of biological origin including bacteria, and viruses, fungi and yeasts, pollens and organic matter.

Airborne particles origination from microbial matter. Together with particles from vegetable and animal origins, they form organic dusts. (AIHA, 1996)

An airborne dispersion of particles, where the particles contain bacteria, viruses, dust mites, fungi (spores or hyphae), or contain other biological entities or parts of biological entities. ( 6-14)

Microscopic living organisms that grow and multiply in warm, humid places.