Mould is microscopic fungi that provoke allergy by liberating spores, particles that are dispersed in the air, especially a the end of summer and in autumn. There are more than 100,000 species of mould and about 31 of these are the ones most commonly found in the home. The most widespread and allergy-provoking in Italy are Alternaria, Cladosporium, Aspergillus and Penicillium. They can grow both inside and outside the home, in conditions of high relative humidity (over 50%). Modern homes, in particular, being poorly ventilated and equipped with very effective insulating systems, favour the increase of humidity, creating an ideal microclimate for mould growth.
> INSIDE THE HOME
Mould can be found above all on damp floors and walls (often behind furniture, in built-in wardrobes, shoe cupboards, etc.), inside mattresses, pillows and couches; in carpets and wallpaper; in the filters of the air heating systems and in air conditioners; in humidifiers and refrigerators; in ornamental plants and in badly kept foods.
> IN THE OUTSIDE ENVIRONMENT
Mould is found above all on the ground and in decomposing organic material (e.g. leaves and fruit that are left on the ground, wood and bark, cereals, etc.) and is particularly widespread in working environments such as paper mills, greenhouses, dairies, meat processing plants.