Hazard classes of indoor mould
Indoor moulds have been grouped into 3 hazard classes based on associated health risk. These classes are similar to risk groups assigned to micro-organisms handled in laboratory environments.
- Hazard Class A: includes fungi or their metabolic products that are highly hazardous to health. These fungi or metabolites should not be present in occupied dwellings. Presence of these fungi in occupied building requires immediate attention.
- Hazard class B: includes those fungi which may cause allergic reactions to occupants if present indoors over a long period.
- Hazard Class C: includes fungi not known to be a hazard to health. Growth of these fungi indoors, however, may cause economic damage and therefore should not be allowed.
Health Problems Associated With Indoor Moulds
Exposure to indoor mould has been associated with the following health problems:
- Lower respiratory symptoms such as coughing and wheezing;
- Respiratory infections such as aspergillosis;
- Allergic diseases, including allergic asthma and bronchitis;
- Non-inflammatory, unspecific symptoms, such as eye and skin irritation, fatigue, headache, nausea, and vomiting.
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