Fungi are an independent family of eukaryotic cell organisms. Most grow in the form of multicellular filaments called hyphens that form a mycelium; Some species also grow as individual cells.

At the time of reproduction, the breeding bodies form the spores, which are dispersed and germinated to form new fungi.

Fungi live on organic matter and play an important role in nature when it comes to decomposition. However, some are pathogens and their presence in closed spaces is a risk to people’s health.

In closed spaces, fungi are basically divided into two types:

• Mould: They are the most common fungi. The alarming signal usually appears when a rotten odour is perceived. They are usually not visible to the naked eye and their detection requires a test of fungal culture.
• Yeast fungi: They are less common than those of mould. They are usually detected by dark colorations. They are not reproduced by spores but by mitosis, a division process called budding.

The effects on health are mainly produced in the respiratory tract, in the form of allergies or infections such as bronchitis. It should be noted that there may be people who are not allergic to dust, but to fungi that live in dust.

Its presence in enclosed spaces usually comes from excessive humidity, usually from 70%. This moisture can be motivated by improper or insufficient ventilation. The final resolution requires at least sanitation work and changing people’s ventilation habits.

However, sometimes the excess of humidity is caused by the building itself: thermal bridges or excessive tightness, which provide the right conditions for the development of fungi. In this case, its final solution requires additional constructive actions apart from sanitation.