Speaker's Highlight

• Don Sin University of British Columbia, St. Paul Hospital (Canada)
  Kenneth R. Chapman Toronto General Hospital Research Institute (Canada)
• Parameswaran Nair McMaster University (Canada)
  Carolyn Calfee UCSF (U.S.A.)
• Gregory P. Downey University of Colorado School of Medicine (U.S.A.)
  David A. Schwartz University of Colorado School of Medicine (U.S.A.)
• Neil Schluger Tuberculosis Control Branch, California Department of Public Health (U.S.A.)
  Nick Kim Critical Care & Sleep Medicine, University of California San Diego (U.S.A.)
• Nicola Hananiah Baylor College of Medicine (U.S.A.)
  Jae-Joon Yim Seoul National University College of Medicine (Republic of Korea)
• Koichiro Asano Tokai University School of Medicine (Japan)
  Diahn-Warng Perng Taipei Veterans General Hospital (Taiwan)
• Konstantinos Kostikas University of Ioannina (Greece)
  Karin Klooster University Medical Center Groningen (Kingdom of the Netherlands)

• Controlling Asthma Triggers in the Home Environment

  Asthma symptoms can change significantly according to what happens inside the home. Dust, smoke, dampness, animal allergens, cleaning products, and poor ventilation may irritate sensitive airways or contribute to allergic inflammation. A healthier indoor environment can reduce exposure and support the treatment plan prescribed by a healthcare professional.

  The goal is not to create a completely sterile home. Instead, families can identify the triggers most closely linked with coughing, wheezing, chest tightness, or shortness of breath and then make practical changes. Keeping a symptom diary can help reveal patterns, especially when symptoms occur at night or after cleaning.

  Trigger control works best alongside prescribed controller medication, an up-to-date reliever inhaler, and regular medical reviews. If breathing becomes severely difficult, speech is affected, or quick-relief medicine does not help, seek urgent medical care.

  Identify the triggers that matter most

  Asthma triggers differ from person to person. Some people react strongly to house dust mites, while others are more sensitive to pets, tobacco smoke, fragrances, mold, or cold air. A careful record of symptoms, activities, rooms, and exposures can help narrow down the likely causes.

  Pay attention to timing. Symptoms that worsen during sleep may point toward bedding, dust mites, bedroom humidity, or an unclean heating and cooling system. Coughing after vacuuming could indicate disturbed dust, whereas symptoms after using aerosol sprays may suggest chemical irritation.

  A clinician can help distinguish asthma from infections, allergies, reflux, or other respiratory conditions. Allergy testing may also be useful when a specific indoor allergen is suspected, although test results should be interpreted together with real-life symptoms.

  Improve indoor air quality

  Tobacco smoke is a major household asthma irritant. Smoking outside is safer than smoking indoors, but smoke residue can still cling to clothing, furniture, curtains, and car interiors. The most effective approach is to keep the home and vehicles smoke-free.

  Strong odors may also aggravate sensitive airways. Air fresheners, scented candles, incense, perfumes, hair sprays, and fragranced cleaning products can release irritating particles or volatile compounds. Choose unscented alternatives where possible, and open windows during and after activities that produce fumes, provided outdoor air quality is acceptable.

  Ventilation should remove moisture and pollutants without creating uncomfortable drafts. Use kitchen and bathroom exhaust fans, maintain heating and cooling equipment, and replace filters according to the manufacturer’s instructions. Portable air cleaners may help in selected rooms, but they do not replace source control or regular cleaning.

  Reduce dust mites and household dust

  House dust mites live mainly in mattresses, pillows, carpets, and upholstered furniture. They thrive in warm, humid conditions, and their waste particles can worsen allergic asthma. Washing bedding regularly in hot water, when fabric care instructions allow, can reduce allergen levels.

  Mattress and pillow encasements provide an additional barrier. Wash blankets and soft toys regularly, and consider keeping plush toys out of the bed if they appear to worsen nighttime symptoms. Reduce clutter in sleeping areas because it creates more surfaces where dust can collect.

  Vacuuming can remove dust, but it may temporarily disturb allergens. A vacuum with effective particulate filtration is preferable. If possible, someone without asthma should vacuum while the affected person stays out of the room, which should then be aired before use.

  Household concern	Practical response	Why it helps
  Dust mites	Encase mattresses and pillows; wash bedding regularly	Limits contact with common allergen particles
  Mold and dampness	Repair leaks, dry wet areas quickly, improve ventilation	Reduces fungal growth and musty irritants
  Pet allergens	Keep pets out of bedrooms; wash hands after handling	Lowers exposure to dander and saliva proteins
  Smoke and fumes	Maintain a smoke-free home; avoid aerosol products	Prevents airway irritation and indoor pollution
  Cleaning dust	Use damp cloths and suitable filtration when vacuuming	Captures particles instead of spreading them

  Manage pets, pests, and mold

  Pet allergens can remain in a home long after an animal leaves a room. If a pet is associated with symptoms, keeping it out of the bedroom is an important first step. Wash hands after handling the animal, clean fabric surfaces, and use a high-efficiency vacuum where appropriate. Decisions about removing a pet should be discussed carefully with family members and a healthcare professional.

  Cockroach and rodent particles can trigger allergic asthma. Store food in sealed containers, remove rubbish promptly, repair cracks, and address plumbing leaks. Avoid indoor pesticide sprays when possible, since their fumes may irritate the lungs; targeted professional treatment or enclosed bait systems may be safer alternatives.

  Mold requires action at its source. Fix roof, plumbing, or window leaks, dry wet materials quickly, and improve airflow in bathrooms and kitchens. Large areas of mold or contamination in heating and cooling systems may require qualified remediation rather than routine household cleaning.

  Clean safely and control humidity

  Regular cleaning is useful, but the method matters. Damp dusting is generally better than dry sweeping because it captures particles instead of sending them into the air. Use cleaning products sparingly, never mix chemicals, and ventilate rooms during use.

  Indoor humidity should be kept moderate. Excess moisture supports dust mites and mold, while very dry air may irritate the nose and throat. A humidity monitor can help identify problems, and dehumidifiers should be emptied and cleaned according to their instructions to prevent microbial growth.

  Families should also check less obvious sources of exposure, including attached garages, wood-burning stoves, renovations, and stored chemicals. Paint, adhesives, and construction dust can provoke symptoms, so people with asthma should avoid renovation areas until fumes and airborne particles have cleared.

  Build a sustainable household routine

  Asthma control improves when trigger reduction becomes part of normal household care rather than a one-time deep clean. A simple schedule can divide tasks among family members and focus effort on the bedroom, bathroom, kitchen, and any room where symptoms occur most often.

  Medical education and respiratory research continue to shape practical advice for asthma management. Professionals and trainees interested in supporting work in this field can review opportunities such as awards and grants, while families can apply established guidance through consistent daily habits.

  Useful steps include:

  • Keep bedrooms smoke-free and well ventilated.
  • Wash bedding regularly and use allergen-resistant covers.
  • Repair leaks and remove visible mold promptly.
  • Choose fragrance-free cleaning and personal-care products.
  • Record symptoms and suspected exposures for medical appointments.

  A written asthma action plan should explain daily medicines, early warning signs, reliever use, and emergency steps. Share it with household members, caregivers, and school or workplace contacts when appropriate. Review the plan after severe symptoms, medication changes, or major changes in the home.

  Small adjustments can make the indoor environment more comfortable and predictable. Start with the trigger most strongly connected to symptoms, track whether the change helps, and discuss persistent problems with a qualified healthcare professional. Take the next step today by checking the bedroom, removing avoidable irritants, and arranging a clinical review if asthma remains difficult to control.

  Richard Russell Nuffield Department of Clinical Medicine, University of Oxford (United Kingdom)
• Mona Bafadhel King’s College London (United Kingdom)
  David Jackson Guy’s and St Thomas’ Hospital, King’s College London (United Kingdom)
• James Chalmers University of Dundee (United Kingdom)
  David Price University of Aberdeen (United Kingdom)