Is black mold dangerous?
Last updated September 3, 2026.
Color is not the risk scale: the CDC says damp, moldy environments may cause stuffy nose, sore throat, cough, wheeze, burning eyes, or rash, worse with allergies, asthma, or weak immunity, and that guidance applies to all mold. The most common indoor molds are Cladosporium, Penicillium, and Aspergillus, and the advice never changes by species: remove what you see or smell and fix the moisture. Scrub hard surfaces with detergent and water and dry fully, throw out moldy porous materials, and call professionals for big areas, sewage damage, or vulnerable occupants. Mention mold exposure to your GP if chest symptoms track with a damp room.
What to do
- Treat any mold the same: remove it and fix the moisture.
- Detergent and water on hard surfaces; bin moldy carpet and ceiling tiles.
- Call professionals for areas over roughly 10 square feet or sewage damage.
- See a GP for persistent cough or wheeze that tracks with a damp room.
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