Mold is a type of fungi that can grow both indoors and outdoors. It is often found in damp or humid environments, and can cause structural damage to buildings.
Mold can cause a number of health problems, including respiratory problems, headaches, and skin irritation. It can also lead to structural damage to buildings, as it can cause wood to rot and weaken.
There are a number of ways to prevent mold growth, including keeping indoor humidity levels low, using mold-resistant building materials, and repairing any water leaks promptly. If mold is already present, it can be removed with special cleaners or by sanding and painting over it.
https://www.cdc.gov/mold/dampness_facts.htm
https://www.epa.gov/mold/mold-remediation-schools-preventing-harmful-exposures#prevent
https://www.lung.org/lung-health-and-diseases/lung-disease-lookup/mold-and-your-lungs