In the context of mould, an allergen is any substance—particularly mould spores—that can trigger an immune response in certain individuals, known as an allergic reaction. Allergic reactions vary widely in severity, from mild symptoms such as a runny nose, itchy eyes, or sneezing, to more intense responses like wheezing, shortness of breath, or even full-blown asthma attacks. Mould spores are known allergens because they can irritate the nasal passages and respiratory system, especially when they are present in high concentrations or when exposure is prolonged.
Allergies to mould can develop over time. Even if someone has not shown allergic symptoms in the past, repeated or high-level exposure in a damp or poorly ventilated work environment can sensitize them. Once sensitivity is established, the individual may experience heightened or more frequent reactions to mould-laden air. This is why prompt investigation of musty odors, water stains, or visible mould growth in workplaces is crucial; it helps limit exposure and reduce the likelihood of employees developing new or worsening allergies.
Employers play a significant role in minimizing allergen risk. By conducting regular inspections, maintaining adequate ventilation, and ensuring prompt remediation of water or mould issues, businesses can keep mould allergens in check. Additionally, where mould presence is confirmed, personal protective equipment (PPE) and administrative controls—such as temporarily relocating employees—can mitigate exposure levels for those who are particularly susceptible to allergic reactions.
