🌦️ How Weather Affects Respiratory Symptoms

Weather has a well-documented impact on respiratory symptoms, especially in people with asthma, bronchiectasis, ABPA, CPA, COPD, and allergic lung diseases. The effects are complex and vary by individual, but here’s a clear, structured overview of what we know:

1. Cold Weather

❄️ Effects:

• Constricts airways (bronchoconstriction), especially in asthma

• Increases mucus production

• Triggers coughing and breathlessness

• Dries out nasal passages, increasing infection risk

🔍 At Risk:

• Asthma, COPD, ABPA, bronchiectasis, CPA

✅ What Helps:

• Wear a scarf or heat-exchange mask to warm inhaled air

• Breathe through your nose, not your mouth

• Use bronchodilators 15–30 mins before going out

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2. Hot Weather & Heatwaves

☀️ Effects:

• Causes airway irritation and inflammation

• Worsens dehydration and mucus thickening

• Triggers fatigue and breathlessness

• Can increase ozone and air pollution levels

🔍 At Risk:

• People on long-term corticosteroids or antifungals (e.g. risk of electrolyte imbalance)

• CPA and bronchiectasis patients who already struggle with mucus clearance

✅ What Helps:

• Stay indoors during the hottest part of the day

• Keep well hydrated to thin secretions

• Use a fan, shade, or cooling cloths — but avoid blowing dust directly into the face

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3. Humid Weather

💧 Effects:

• Promotes fungal and mould spore growth (e.g. Aspergillus)

• Feels harder to breathe due to reduced air density

• May worsen allergic responses in ABPA or SAFS

• Can lead to damp indoor environments

✅ What Helps:

• Dehumidifiers indoors (aim for 40–60% humidity)

• FFP2/FFP3 masks during gardening or compost use

• Avoid indoor drying of clothes if dampness is a problem

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4. Sudden Weather Changes (e.g. Pressure Drops, Storms)

⛈️ Effects:

• Trigger asthma and ABPA flares

• Can cause “thunderstorm asthma” due to pollen breakdown and airborne allergen spikes

• Barometric pressure changes may affect sinus and airway pressures

✅ What Helps:

• Monitor air quality and pollen forecasts

• Stay indoors with windows closed during storms

• Use antihistamines or inhalers preventatively if needed

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🌬️ Air Pollution and Weather

Weather also affects how pollutants (e.g. nitrogen dioxide, ozone, particulate matter) accumulate:

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🧪 Evidence Highlights

• Cold, dry air has been shown to trigger bronchospasm in asthmatic and bronchiectatic patients (European Respiratory Journal, 2020)

• Thunderstorm asthma events have caused hospital surges (e.g. Melbourne, 2016)

• High humidity increases airborne fungal spore concentrations, including Aspergillus fumigatus

• Pollution and weather combinations increase hospital admissions for respiratory disease (Lancet Planetary Health, 2019)

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✅ General Tips for Respiratory Patients

• Track air quality, pollen, and weather using apps (e.g. Breezometer, AirVisual, Met Office)

• Plan medication use around forecasted triggers (e.g. pre-treat with reliever inhaler)

• Use air purifiers or dehumidifiers at home if needed

• Layer clothing to control temperature and humidity exposure

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