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Common Indoor Moulds & Their Hazard Classes

This is a list of some of the most common indoor moulds and their hazard classes. For an explanation of these hazard classes, read the May 24 post entitled “Indoor Moulds: Hazard Classes And Associated Health Effects”. The list is not exhaustive. At least 150 moulds have been reported from buildings.

Acremonium spp (hazard class B).
Alternaria spp (hazard class B).
Aspergillus flavus (hazard class A).
Aspergillus fumigatus (hazard class A).
Aspergillus versicolor (hazard class A).
Aureobasidium pullulans (hazard class B).
Chaetomium globosum (hazard class C).
Cladosporium cladosporioides (hazard class B).
Cladosporium sphaerospermum (hazard class C).
Fusarium spp (hazard class A).
Mucor spp (hazard class A).
Paecilomyces spp (hazard class B).
Penicillium aurantiogriseum (hazard class B).
Penicillium chrysogenum (hazard class B).
Scopulariopsis spp (hazard class B).
Stachybotrys chartarum (hazard class A).
Trichoderma spp (hazard class B)
Ulocladium botrytis (hazard class C).
Wallemia sebi (hazard class C).

These moulds are commonly found on water damaged or damp surfaces in kitchens, basements, bathrooms, ceilings, and other drywalls. Occurrence of some of these moulds such as Stachybotrys, Fusarium, Ulocladium and Trichoderma in a building is an indication of serious water damage.

Do you have a question concerning indoor moulds? Send your question to My Question.

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