A prevalent allergen, A. alternata forms grey to dark-brown or black colonies and can often appear “fuzzy” or velvety. It thrives on plant materials, wood, and damp indoor surfaces like shower curtains or window frames. This species is well known for provoking hay fever, asthma, and other respiratory complaints. Keeping bathrooms, kitchens, and basements dry and mould-free is crucial for reducing its impact on indoor air quality.
