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Smoke & Vaping Aerosol
Secondhand smoke and other inhaled irritants can worsen symptoms. Keep homes and vehicles smoke-free.
Prevention
Know your triggers. Reduce your risk.
Asthma triggers differ from person to person. Work with a healthcare professional to identify your triggers and include them in your asthma action plan.
Common Triggers
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Viruses
Colds, flu, and other respiratory infections can trigger attacks. Follow prevention guidance and your treatment plan.
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Outdoor Air
Ozone, particle pollution, wildfire smoke, and cold air can worsen asthma. Check air-quality alerts and adjust activity.
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Dust Mites
Wash bedding regularly, reduce dust-collecting clutter, and consider allergen-proof mattress and pillow covers.
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Mold & Moisture
Fix leaks, dry wet materials promptly, clean hard surfaces, and keep indoor humidity near 30–50% when possible.
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Pets & Pests
Dander, cockroach particles, and rodent allergens can be triggers. Use cleaning, sealing, and lower-risk pest management.
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Chemical Irritants
Fragrances, sprays, cleaners, workplace substances, and strong fumes may trigger symptoms in some people.
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Exercise
Physical activity is important. A clinician can help create a plan that allows safe exercise while controlling symptoms.
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Allergens
Pollen, mold spores, and other allergens may cause seasonal or year-round symptoms.
Create a trigger log: note where you were, what you were doing, weather or air quality, exposures, symptoms, and medicines used. Share patterns with your healthcare team.
Sources: U.S. Environmental Protection Agency asthma-trigger guidance, updated July 6, 2026 and February 17, 2026; NHLBI asthma guidance.