For most healthy adults, this exposure typically causes irritation like worsened allergies, sinus congestion, or coughing. However, the risk is significantly higher for infants, the elderly, or anyone with asthma or compromised immune systems, as some mould species can produce mycotoxins.

Given Dubai’s climate, this is not something to ignore. The problem will not resolve itself and will likely worsen during the more humid summer months. It is advisable to have a professional inspection within the next few weeks. A proper assessment involves more than a visual check; it should include air and surface sampling to be analysed by a microbiology lab. This identifies the specific mould type and concentration, which determines the actual health risk and the required remediation method.

Do not attempt to clean it yourself with bleach, as this can aggravate the spores and spread them further. A certified remediation team will contain the area, use HEPA filtration to capture spores, and apply specialised biocides to treat the entire duct system, not just the visible spot. The key is to verify that the company provides documented before-and-after lab results to confirm the issue is resolved.