What are bioaerosols?

Bioaerosols are solid or liquid particles of biological origin that float in the air. They originate from both natural sources such as soil, plants, and water bodies, as well as anthropogenic sources such as wastewater treatment plants, animal husbandry, food production, and medical facilities. Bioaerosols can contain pathogens, allergens, or toxins and therefore play an important role in environmental and health hygiene.

Formation

Bioaerosols are formed by mechanical processes such as atomization, evaporation, air movement, or biological activities such as spore release in fungi. In industrial plants, bioaerosols can be released, for example, during the processing of organic materials, in cooling towers, in composting plants, or in agriculture through animal husbandry.

Detection

Bioaerosols are invisible to the naked eye and require special detection methods. These include air samplers, filtration, impaction, or the use of molecular biological methods such as PCR. Their concentration and composition depend heavily on environmental conditions such as temperature, humidity, and air flow. Odors or visible mold growth are often indirect signs of increased bioaerosol contamination.

Limit values

There are currently no uniform legal limit values for all bioaerosols. However, guideline and orientation values exist in specific areas of work, e.g., in food production or healthcare. The Technical Rules for Biological Agents (TRBA) specify protective measures and classifications for activities involving biological agents.

Hazards

Bioaerosols can pose a variety of health risks. Pathogens such as Legionella, influenza viruses, or mold can cause infections, allergies, or toxic reactions. In sensitive environments such as hospitals or food factories, uncontrolled bioaerosol contamination can lead to serious hygiene problems. Environmental pollution is particularly relevant where bioaerosols are released in large quantities and can be transported over long distances.