Indoor Air Quality for Older Lungs: Dust, Smoke and Damp

Why older lungs are more vulnerable

• The airways and lung tissue lose elasticity with age, and the lungs clear particles less effectively.
• Chronic conditions such as COPD, asthma, bronchiectasis and heart failure leave less reserve.
• Immune defences weaken, so irritation and infection come more easily.
• Older adults often spend long hours indoors, in one room, close to the same sources.
• Medicines, reduced mobility and cognitive problems can make it harder to avoid or report irritants.

The main indoor irritants

Cooking smoke. Burning wood, dung, coal or kerosene produces fine particles and gases that raise the risk of COPD, chest infections and heart problems. Even gas cooking, and especially frying and tadka at high heat, produces particles and gases such as nitrogen dioxide. Poorly ventilated kitchens, open to the living area, spread the pollutants.

Incense, agarbatti, dhoop, camphor and candles. Smoke from these contains fine particles and irritating chemicals. They are part of many households' daily worship, which deserves respect, but can trigger cough, wheeze and breathlessness in people with sensitive lungs.

Mosquito coils and vaporisers. Coils produce a lot of smoke and particles, comparable to burning many cigarettes over a night, and vaporisers release chemicals into a closed room. Use nets, screens and other methods instead where possible.

Tobacco and bidi smoke. A leading cause of lung disease for smokers and non-smokers alike. Do not allow smoking indoors.

Dust and dust mites. Dust from outside, sweeping, fabrics and carpets, and dust mites living in bedding, mattresses and soft furnishings, trigger allergy and asthma.

Mould and damp. Leaking walls, damp bathrooms, wet clothes drying inside and humid monsoon months create mould, which releases spores that irritate airways and can trigger asthma and infections. A musty smell is a sign.

Pests and allergens. Cockroach and rodent droppings and pet dander are common allergens.

Chemicals and fragrances. Strong floor and toilet cleaners, phenyl, bleach, air fresheners, sprays, perfumes, pesticides, paints and varnishes release fumes that irritate. Mixing cleaning products, especially bleach with acids or ammonia, can release dangerous gases.

Gas and combustion hazards. Faulty gas appliances, geysers, heaters and charcoal braziers can release carbon monoxide, which is invisible and can kill. See smoke and gas safety for older adults and safe use of heaters and geysers.

Outdoor pollution coming in. Fine dust and smoke enter through gaps, windows and doors, particularly in pollution seasons; see a pollution season plan for older adults.

Signs that indoor air may be affecting your parent

• More cough, wheeze, chest tightness or breathlessness at home, particularly at night or in a certain room, and relief when away.
• Eye, nose or throat irritation, repeated colds or sinus problems.
• Morning headaches or tiredness, which could also signal other problems and should be checked.
• A musty smell, visible mould, damp patches or condensation.
• Worsening symptoms during pollution season, festival days, cooking or after cleaning.

Tell the doctor, who may adjust treatment and look for other causes. Peak flow readings can reveal patterns in asthma; see peak flow meters: tracking asthma and breathing at home.

Practical steps room by room

### Kitchen

• Ventilate while cooking: use a chimney or exhaust fan that vents outdoors, and open a window. Keep the older adult away from the kitchen during frying and strong cooking.
• Move to cleaner fuel where you can: LPG, piped gas or electric or induction rather than wood, dung or coal. Where wood or coal cannot be avoided, use an improved stove with a chimney and cook outdoors or in a separate, ventilated space.
• Keep gas appliances serviced, and look for yellow or orange flames, soot or a smell of gas, which signal a problem.
• Cover pots when possible, and reduce high-heat frying.
• Clean grease and avoid scorched food.

### Living room and prayer area

• Reduce incense, camphor and diya smoke where possible: use small amounts, place them near a window or in a separate ventilated corner, or choose smokeless options such as flowers, electric lamps or sound. Avoid burning incense in the older adult's bedroom or closed rooms. A family conversation about this needs sensitivity.
• Avoid smoking inside.
• Dust: damp-wipe surfaces and damp-mop floors rather than dry sweeping. Use a vacuum with a good filter if available. Have the older adult leave the room during cleaning.
• Reduce clutter and heavy curtains, rugs and soft items that hold dust.

### Bedroom

• Keep it simple and clean: minimal fabric, no stuffed toys, no storage under the bed.
• Wash bedding weekly in hot water if the fabric allows, and dry in sun. Use dust-proof mattress and pillow covers for people with dust mite allergy.
• Avoid mosquito coils; use nets, window screens, and vaporisers only with ventilation and with the doctor's agreement.
• Keep pets out if allergic.
• Avoid strong fragrances, room sprays and air fresheners.
• Consider a purifier in a closed bedroom in polluted seasons; see air purifiers: choosing one for an older adult's room and air purifier filters: replacement, costs and maintenance.
• Oxygen safety: if oxygen is used, no flames, smoke or incense in the room; see using an oxygen concentrator safely at home.

### Bathroom

• Ventilate with an exhaust fan or window, and wipe down wet surfaces after use.
• Treat mould with a mild approach: remove with a damp cloth and a suitable cleaner, wearing a mask and gloves, while the older adult stays elsewhere. Ask a professional for large infestations. Fix the leak that causes it.
• Use gentle cleaning products; never mix cleaners.

### Whole home

• Control damp: repair leaks and seepage before the monsoon, keep furniture a little away from walls, avoid drying clothes in bedrooms, and consider a dehumidifier if humidity stays high. See pest, damp and mould at home.
• Manage pests safely, with sealing and cleanliness rather than frequent sprays. If pesticides are used, keep the older adult out until the room is aired.
• Ventilate: open windows when outdoor air is better, usually mid-day on moderate days, and close them in peak pollution. Cross-ventilation helps. See temperature and ventilation at home.
• Check combustion appliances and install smoke and carbon monoxide alarms where fuel is burned.
• Avoid paint and varnish fumes: keep the older adult elsewhere during renovations and for some days after.
• Keep the home free of tobacco smoke.

Measuring the air

A low-cost monitor can show PM2.5 levels and humidity and reveal that cooking, incense or coils make the air much worse. Treat the numbers as rough; see air quality monitors for homes with older adults. Do not rely on a monitor to decide medical matters.

Balance with comfort, culture and cost

Not every change is possible or acceptable. Worship, cooking traditions and housing conditions matter. Prioritise the changes that give most benefit for the least disruption: ventilation during cooking, keeping smoke out of the bedroom, damp control, dust control and no tobacco. A step-by-step approach, guided by your parent's symptoms, works better than a long list of demands.

Do masks help?

Well-fitting masks that filter fine particles can reduce exposure outdoors on bad days, but they can be hard to tolerate for people with lung disease because they add breathing resistance. Ask the doctor whether and which type is appropriate. Cloth masks give limited protection against fine particles.

When to ask a professional

Ask the doctor whether your parent's symptoms may be related to home air and whether treatment should change. Ask a pharmacist about masks and inhaler use. Call an electrician or gas technician for suspected faults, and a pest or damp professional for major problems. Call the doctor if cough, wheeze or breathlessness increases, and call 112 for severe breathlessness, blue lips, confusion, chest pain or suspected carbon monoxide poisoning (headache, dizziness, drowsiness and confusion, especially if several people are affected): move everyone into fresh air and call.