Is AC mold causing our respiratory issues?« Back to Previous Page

Yes, the black substance on your AC filter is very likely mold, and it is a common cause of the persistent respiratory symptoms you're describing, especially in Dubai's climate. The constant humidity and condensation inside AC units create an ideal environment for mold growth. When the system runs, it aerosolizes these spores and blows them directly into your living space, causing the coughing and allergic reactions you and your children are experiencing.

Your first step is to stop the exposure. Turn the AC unit off at the thermostat. Do not attempt to clean the heavily contaminated filter yourself; seal it in a plastic bag and dispose of it immediately. Wipe down any visible surfaces around the vent with a damp cloth and a mild detergent, but avoid using bleach or other harsh chemicals that can become airborne irritants themselves.

For a situation this advanced in an older building, a professional inspection is strongly recommended. DIY cleaning often just disturbs the mold, making the problem worse. A certified inspector can assess the entire ductwork and evaporator coil—where the most severe growth often hides. They should use lab analysis to identify the mold species, which determines the appropriate remediation method. In Dubai, look for providers registered with Dubai Municipality or who can show certified methodologies, as proper containment to prevent cross-contamination is crucial.

Until the system is professionally addressed, improve ventilation in your apartment by opening windows when outdoor humidity is lower, typically in the early morning or evening. Using standalone HEPA air purifiers in the bedrooms can also help reduce airborne spores and provide some relief.