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That wall likely has active mold growth from the AC condensate leak, and the symptoms you describe are a common reaction. The combination of constant moisture and Dubai's heat creates an ideal environment for mold to proliferate inside wall cavities, often out of sight. You should address this within the next week to ten days to prevent it from spreading further into the drywall or HVAC system, which increases remediation complexity.

Continuous exposure to mold spores, even from a small area, can cause the exact inflammatory responses you note—morning congestion and headaches that improve when away from the source. For individuals with asthma or allergies, these effects can be more pronounced.

The most effective approach is to first have a professional inspection to assess the extent of the moisture damage behind the wall. Simply wiping the visible spots is insufficient if the wall's interior is wet. A proper remediation will involve stopping the AC leak at its source, drying the affected structure completely, and then removing the contaminated materials. Many companies in Dubai now use moisture meters and thermal imaging to verify the damp areas before any work begins.

After remediation, ensure the area is verified as dry. To prevent recurrence, maintain your AC unit with regular servicing to ensure proper drainage and consider using a dehumidifier if indoor humidity consistently feels high.