Sources of Bioaerosols in Indoor Environments

This chapter examines all indoor bioaerosol sources to pinpoint the influence of each on biological air quality within buildings. Bioaerosols are particles (like bacteria, fungi, pollen, and pet dander) that enter indoor spaces through infiltration or other activities carried out by humans. The effectiveness of indoor air quality management systems, which are crucial for modeling bioaerosol movements, is significant for dynamic modeling. Movement of people through ventilation and open windows brings indoor buildings pollen, fungal spores, and dust, carrying bioaerosols from outdoor spaces. Depending on the location and season, the density of bioaerosols in the ambient air can vary. Over the past decades, human activity sources have remained constant, but their intensity varies depending on the frequency and type of activity. High concentrations of bioaerosols are released from allergens and microorganisms present in the home environment, and pet grooming, vacuuming, and dusting activities release them into indoor air. Indoor air systems that are not adequately maintained are infested with dust, mold, and bacteria, thereby increasing their presence.