Thereโs a lot of talk about black mould being toxic โ which it can be. But not all black mould is dangerous.
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John Liddell, Managing Director of The Mould Doctor, says, โThere are over 100,000 different types of mould. Not all types of mould are a threat, some are fairly benign, and some even have medicinal uses.โ
He adds: โPenicillium is used in the production of penicillin, an antibiotic commonly prescribed to cure strep throat, bronchitis, and other forms of infection.โ
The problem is that itโs tough to identify different mould types unless you are a professional.

Lucinda Curran is an Indoor Environmental Health Consultant. She says, โThere is a lot of alarm around, โblack mould.โโ
โThis particular mould is Stachybotrys chartarum, and it is known to have devastating effects on health, especially in those sensitive or sensitised to it,โ says Lucinda.
While some species of black mould are toxic, Lucinda says others can be equally problematic, depending on the individual.
โPeople can become sensitised to a particular genus or species of mould,โ says Lucinda. โThis often occurs through repeated exposure to it. For instance, living or working in a mouldy environment. Eventually, the person can begin to react to that particular genus or species of mould.โ
Speaking from personal experience, Lucinda says, โI have become very sensitive to specific genera of moulds due to the number of mould assessments Iโve done.โ
If you are concerned about your health, you should chat with your doctor or another health professional.

How do you know if black mould is toxic?
There are two types of toxic mould: Stachybotrys and Memnoniella. The most common type of toxic mould in homes is Stachybotrys, which needs a direct water source to grow.
Unless youโre a professional, itโs impossible to tell if the mould growing in your home is toxic.
โIdentifying mould is a specialist area,โ says Lucinda. โMould is examined under a microscope by mycologists. In my line of work, unless it has been sampled and sent to a lab for analysis, something that looks like mould is called โsuspected visible mould.โ
The semi-good news is if you have toxic mould in your home, โtheir spores are unlikely to travel far.โ
โThe spores of Stachybotrys chartarum are quite sticky, which means they often clump together. Their spores are unlikely to travel far through the air because they are heavy,โ says Lucinda.
โThat said, it can spread โ but it wonโt go from one end of the house to the other in a short space of time without some sort of help.โ
If you discover a large amount of mould growth in your home, you should call a professional mould removal company to inspect the area and determine if your home requires treatment.
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