Is our AC leak causing toxic lback mold?« Back to Previous Page

An AC leak is a primary cause of indoor mold growth in Dubai's climate. The constant condensation provides the moisture mold needs to thrive. The black spots are likely Cladosporium or another common species, but only a lab culture can confirm the type. While the term "toxic black mold" (often Stachybotrys) is overused, any mold colony can cause the symptoms you describe—stuffy nose, persistent cough, and irritation—especially when the AC circulates spores.

For professional testing, do not disturb the area. A proper inspection involves both air and surface sampling. The air sample tests for elevated spore counts in the room compared to the outdoors, while a tape or swab sample from the wall is sent to a microbiology lab for genus/species identification. This evidence-based approach is critical.

Effective removal requires addressing the root cause: the AC leak. A technician must fix the drain line or condensation pan. For remediation, the affected section of drywall must be carefully removed and disposed of, as mold roots (hyphae) penetrate porous materials. Simply wiping or spraying the surface will not prevent regrowth. Adjuvant antimicrobial treatments are applied to the cavity. The area must then be dried with industrial air movers to restore normal moisture levels.

To prevent recurrence, ensure your AC unit is serviced quarterly to prevent drain line blockages—a frequent issue here. Maintain indoor humidity below 60% using a dehumidifier or your AC's dry mode, especially during the humid summer months. A post-remediation verification test is the only way to confirm the space has been returned to a normal fungal ecology. Companies with their own lab can provide this before-and-after data for accountability.