But there soon may be, say federal officials. Increasing scientific data indicating there are health risks associated with bioaerosol exposure may lead to enforcement. Where the human immune system is involved, reactions to bioaerosols are very individual-specific and can be highly variable across the population. Because microorganisms need water to grow, moisture plays a critical role in many indoor air quality problems. Accumulation of moisture via leaks, broken pipes or poor dehumidification by HVAC systems can lead to microbial growth.
Fungi are most common because require less moisture to readily grow.
This means displacing respired carbon dioxide, body odors, fragrances, skin flakes and other particles shed from clothing and from office equipment like copiers and printers. The other crucial role of ventilation is dehumidification. Improperly specified heating, ventilating and air conditioning equipment may induce moist air into the room. Condensation can occur, which will, in turn, provide the water necessary for microorganisms to grow. The microbiology of indoor air in most buildings looks like outdoor air.