| Mask Type | Who Might Use It | When It’s Used |
|---|---|---|
| FFP2 (95% filtration) | Some patients with CPA, ABPA, or SAFS, especially during flares or hospital visits | During travel on public transport, clinic waiting rooms, visiting building sites, or dust exposure |
| FFP3 (99% filtration) | Patients who are severely immunocompromised (e.g. post-transplant, on chemotherapy, or high-dose steroids) | In high-risk environments: hospital construction, building work nearby, or heavy dust/mould exposure |
✅ When Masks Might Be Advisable
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During hospital visits, particularly in winter or during flu/COVID waves
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If you’re immunosuppressed, e.g. taking long-term steroids or biologics
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When exposed to mouldy buildings, compost, building work, or flood damage
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In crowded indoor environments where infection risk is high
❌ When They’re Usually Not Needed
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Day-to-day life in a clean, dry home environment
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Low-risk outdoor activity (e.g. walking in the park)
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If your asthma/ABPA/CPA is stable and you’re not immunocompromised
🗣️ What the National Aspergillosis Centre Recommends
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Use FFP2 masks when entering environments likely to have airborne fungal spores
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FFP3 masks may be offered for high-risk medical procedures or when severely immunocompromised
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Masks are one part of a broader protection strategy, which includes:
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Good indoor air quality (HEPA filters, ventilation)
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Avoidance of dusty environments
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Prompt treatment of fungal infections
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