Biological Contaminants
The indoor environment can be contaminated with a variety of microorganisms such as viruses, bacteria and molds.
Major sources
- Domestic pets
- Bathroom and other damp places
- Air conditioners, humidifiers and dehumidifiers
Health effects
Both infection and allergic diseases can result:
Infection
- Virus — “flu”, common cold
- Bacteria — Legionnaires' disease, tuberculosis
- Molds — Aspergillus infection
Allergic diseases
- Molds — allergy to Aspergillus can cause asthma
- Thermophilic bacteria — can contaminate air-conditioning system or humidifiers in offices, homes and automobiles and cause hypersensitivity reaction in the lungs
How to reduce biological contaminants
- Provide plenty of ventilation in the home and office
- Maintain and disinfect the ventilation system, air conditioners, humidifiers and dehumidifiers
- Remove and discard contaminated materials such as mouldy carpets and ceiling tiles
- Wash contaminated surfaces with dilute bleach
- Install and use exhaust fans in kitchens and bathrooms that are vented outdoors to reduce humidity
- Check and correct any water leaks in the building
