Hazard Classes
Some countries have adopted a hazard class system to place moulds in different categories based on their health risks. They are broken into Hazard classes A, B and C:
Hazard class list
- Hazard Class A:
Moulds in this group are either directly hazardous to health due to risk of infection or creation of toxins. They should not be in homes or workplaces and should be removed right away if found. - Hazard Class B:
Moulds in this group can cause allergic reactions, especially over longer periods of time. - Hazard Class C:
Moulds in this group aren't known to cause any health risks or reactions in humans. Note, however, that even moulds in this category can potentially cause structural damage to things that they are growing on, and should still be gotten rid of.