PM2.5 Dust, Older Adults and Bedbound Parents: How to Read Air Quality and Set Up a Clean-Air Room at Home

PM2.5 dust and older adults call for more care than for the general public. Thailand's Pollution Control Department lists older people, people with heart and blood vessel disease, and people with respiratory disease as "at-risk groups" who are more affected by fine dust than others. Bedbound parents are not protected just because they stay indoors: dust gets into the room. What you can do straight away is check the dust level every morning on the Pollution Control Department's Air4Thai app or website. From yellow (PM2.5 25.1–37.5 micrograms per cubic metre), start sealing your parent's room as a clean-air room and run an air purifier sized for that room; above 37.5 (orange), cut down time outdoors, and watch for coughing, breathlessness or chest tightness. If your parent has chest pain or cannot breathe properly, call 1669 immediately.

Many families find themselves in a similar situation. Father is bedbound in a room with the windows open all day because the family worries about stale air. When the sky turns hazy, he starts coughing more, has more phlegm and sleeps badly. His children run his oxygen concentrator for longer, thinking it will make the air better. This guide explains why older and bedbound people are at higher risk, how to read the dust level correctly, how to set up a practical clean-air room at home, how to choose and place an air purifier, how to care for a parent with a tracheostomy or on oxygen, and why an oxygen concentrator is not an air purifier.

Quick answer

• Older adults, people with heart or lung disease and bedbound parents are at-risk groups for PM2.5. Even indoors, outside dust gets in, and there is dust from inside the home too, such as incense, mosquito coils, cigarette smoke and frying
• Check dust levels on the Pollution Control Department's Air4Thai. Thailand's 24-hour average standard for PM2.5 is no more than 37.5 micrograms per cubic metre; at-risk groups should start taking precautions from yellow upwards
• You can set up a clean-air room yourself: choose a room with few openings, close doors and windows, seal gaps, run an air purifier, wipe surfaces with a damp cloth and take off shoes before entering
• Choose an air purifier whose CADR is large enough for the room, with a HEPA filter; avoid models designed to produce ozone, and replace filters as the manual says
• An oxygen concentrator does not purify room air. Use it only as prescribed and never raise the flow because of dust. For a parent with a tracheostomy, never cover the stoma with a mask; ask the hospital team
• Frequent coughing, wheezing, chest tightness or palpitations: talk to a doctor or nurse. Chest pain, too breathless to speak or bluish lips: call 1669

1. Why is PM2.5 more dangerous for older and bedbound adults?

The main reason is that older bodies have less reserve, and many already have heart or lung disease. The World Health Organization (WHO) states that fine particulate matter causes cardiovascular and respiratory disease and cancers, and lists older people among the groups at higher risk. Thailand's Pollution Control Department also defines "at-risk groups" as including people over 60, people with heart and blood vessel disease, and people with respiratory disease.

Bedbound parents also have several factors that add to their risk:

• They stay in one room almost all day If dust gets into that room easily, they breathe it day and night, unlike people who go out to work and come back
• Their cough is weak When the airways are irritated, phlegm increases but is not cleared well
• They may not be able to tell you Many cannot speak or have dementia, so the family has to watch their breathing, eating and sleep
• They cannot wear a mask Parents who lie in bed all the time, are already breathless or have a tracheostomy cannot use a mask the way others do, so their room has to be the main line of defence

Something many families do not realise is that indoor dust does not only come from outside. The WHO names indoor sources such as cooking, smoking and burning incense. Many Thai homes have incense at the household shrine, coil mosquito repellents and an open kitchen next to the living room where food is stir-fried and deep-fried, all of which add dust even on days when the outside air is clean.

2. Where to check the dust level, and what level is dangerous

The official source is Air4Thai, run by the Pollution Control Department, available as a website and as the Air4Thai app, showing readings from monitoring stations across the country. Choose the station closest to your home and check it every morning before planning the day.

Information as of October 2026 from Air4Thai: Thailand's PM2.5 standard is a 24-hour average of no more than 37.5 micrograms per cubic metre, and an annual average of no more than 15. Thailand's Air Quality Index has 5 colours, which match 24-hour PM2.5 levels as follows:

• Blue (very good) 0–15.0: everyone can go about life as normal
• Green (good) 15.1–25.0: at-risk groups should watch for unusual symptoms
• Yellow (moderate) 25.1–37.5: close to the standard. At-risk groups should wear a PM2.5 mask whenever they go outdoors, cut down strenuous outdoor activity, and see a doctor promptly if symptoms appear
• Orange (starting to affect health) 37.6–75.0: above the standard. At-risk groups should avoid strenuous outdoor activity, wear a mask outdoors and follow their doctor's advice
• Red (affecting health) 75.1 and above: everyone should avoid outdoor activities. People with existing conditions should stay somewhere protected from pollution, have the necessary medicines and equipment ready, and strictly follow their doctor's advice

Thailand's Department of Health, Ministry of Public Health gives similar advice: above 37.5 micrograms per cubic metre, reduce outdoor activities; above 75, stay mainly in a clean-air room.

A common mix-up: the AQI number and the PM2.5 reading are two different numbers. Look at the colour and the PM2.5 value in micrograms per cubic metre together, not just the biggest number on screen.

For older adults, bedbound parents and those with heart or lung disease, do not wait for orange before taking action. From yellow, it makes sense to close up the room and run the air purifier.

3. Setting up a clean-air room for an older parent: 6 steps you can do yourself

A clean-air room does not require renovation. Thailand's Department of Health, Ministry of Public Health recommends basic steps that a family can complete in a day. Choose the room where your parent spends the most time, which for a bedbound parent is their bedroom.

1. Choose the room Away from dust sources, for example not next to the road or kitchen, with few gaps around doors and windows
2. Close doors and windows fully on high-dust days
3. Check for and seal gaps around doors, windows and vents to the outside with tape or cloth; a rolled towel at the bottom of the door helps a lot
4. Choose an air system An air purifier, a filtered fresh-air system, or both; choosing a purifier is covered in section 4
5. Clean with a damp cloth Wipe floors and furniture with a well-wrung damp cloth instead of sweeping, which stirs dust up
6. Reduce dust carried in Take off shoes before entering and avoid opening and closing the door unnecessarily

Beyond these six steps, homes with older adults should also:

• Remove dust sources in and near the room No incense, no coil mosquito repellents, no smoking indoors, and close the kitchen door when frying. Use a mosquito net or smoke-free methods instead
• Change bed sheets and wash curtains more often during high-dust periods
• Do not seal the room all season The WHO notes that sealing measures such as keeping windows closed can lead to carbon dioxide build-up indoors. When outdoor dust drops to blue or green, open the windows for a while to air the room, then close them again when dust rises
• An air-conditioned room still needs to be a clean-air room Do not assume running the air conditioner clears the dust. On high-dust days, seal the gaps and run an air purifier too, and clean the air-conditioner filter on schedule

4. How to choose and place an air purifier for an older parent

The short answer is to look at room size before brand. The US Environmental Protection Agency (EPA) advises choosing a portable air cleaner with a clean air delivery rate (CADR) large enough for the room: multiply the length by the width of the room where you will use it and compare the result with the maximum room size on the packaging. Thailand's Department of Health, Ministry of Public Health advises a CADR more than 3 times the room's volume (width × length × height); find it on the box or in the manual, make sure the units match, and ask the seller if unsure. Units with a high CADR often use a HEPA filter, and it is worth checking for the Thai Industrial Standard (TIS) mark.

Principles that apply to every brand:

• Right size for the room A unit too small for the room cannot keep up. On a limited budget, one unit suited to your parent's bedroom is better than several small ones spread around the house
• Avoid units designed to produce ozone The EPA states that ozone is a lung irritant, and the WHO warns about ozone produced by some electrostatic filters. If you are unsure whether a unit produces ozone, ask the seller before buying
• Place it in the room your parent uses Keep it away from curtains or anything that blocks airflow
• Run it higher and longer on high-dust days The EPA notes that higher fan speeds and longer run times filter more air. If the noise bothers your parent at night, run it high during the day and turn it down at night
• Replace filters on schedule A clogged filter does not work well. Follow the manual; a Department of Health, Ministry of Public Health news release advises checking regularly and replacing about every 6 months, and heavy dust may mean replacing sooner

What to expect: the WHO reports that, in real homes, portable air filters reduce indoor PM2.5 by around 40–82%, depending on the unit, the room size and how well the room is sealed. That figure is the drop in dust concentration in the room, not a matching reduction in symptoms or illness, and the WHO says real-world effectiveness is not yet clear enough to recommend portable filters as a general public health measure. In practice, an air purifier helps more alongside a sealed room, not in a room with the windows open.

5. N95 masks for older adults, and bedbound parents who cannot wear a mask

Masks are for when your parent has to go outside on a high-dust day, such as for a doctor's appointment. They do not need to be worn all day in a room already set up as a clean-air room. The Department of Health, Ministry of Public Health advises wearing a mask that fits the face properly and replacing it immediately if it changes colour or tears; when PM2.5 is above 75 micrograms per cubic metre, it recommends an N95 mask when going out is unavoidable. It also notes that older people and those with existing conditions may choose a surgical mask instead of an N95.

Precautions for older adults:

• Parents with lung or heart disease, or who are already breathless The WHO cautions that people with respiratory disease need to be careful with respirator-type masks because they increase breathing resistance. Ask their doctor which mask is suitable. If wearing one makes breathing uncomfortable or causes chest tightness, tiredness, headache or nausea, take it off and move into the clean-air room, as the Department of Health, Ministry of Public Health advises. But if their lips or tongue look bluish, they are very breathless or drowsy, call 1669 immediately; do not wait to see whether removing the mask helps
• Parents who lie in bed all day Wearing a mask all day is unnecessary and unsafe; use the clean-air room as the main defence instead
• Parents with a tracheostomy They breathe through the tracheostomy tube rather than the nose and mouth, so a face mask does not help, and you should never cover the stoma with a mask or thick cloth on your own. Ask the hospital team what kind of protection to use
• One mask per person, and do not reuse it once it is damp or loose

On high-dust days when your parent must go to a hospital appointment, keep the car windows closed, minimise waiting outdoors, and ask the hospital whether a non-urgent appointment can be moved.

6. Extra care for a parent with a tracheostomy or on home oxygen during high-dust periods

The short answer is to keep the room especially clean, watch phlegm more closely, and consult a nurse rather than adjusting equipment yourself, whether it is humidity, phlegm or oxygen flow.

A parent with a tracheostomy

• The nose is the body's natural filter and humidifier, but air entering through a tracheostomy tube bypasses it, so the room needs to be even cleaner
• Watch the phlegm If there is more of it or it changes colour, tell the nurse the same day. If it is so thick that suctioning is difficult, or your parent starts breathing harder, contact the nurse straight away; if they struggle to breathe, it cannot be suctioned or their lips turn bluish, call 1669
• Humidity Ask the hospital team which humidification method suits your home; do not switch methods yourself because the air-conditioned room feels dry
• Neck covers can be used if they are a thin fabric the team recommends, not so tight that breathing is harder and not so thick that you cannot see the skin around the tube

Day-to-day care is covered in tracheostomy care at home.

A parent using an oxygen concentrator

• Use only the flow rate and hours the doctor prescribed The NHS advises using home oxygen only if a doctor has prescribed it and never stopping or changing the flow yourself. If your parent seems more breathless during high-dust days, call the doctor or nurse rather than turning it up
• Keep the concentrator in the clean-air room, in an open space with vents unblocked, and never burn incense, candles or coil mosquito repellents near someone using oxygen: besides adding dust, it is a fire risk
• Clean the machine's filter as the manual says; in dusty periods it may get dirty faster

Common problems with home concentrators, such as overheating, alarms or kinked tubing, are covered in common problems when using an oxygen concentrator at home.

7. Can an oxygen concentrator purify the air?

No. An oxygen concentrator draws in room air, removes the nitrogen and delivers concentrated oxygen to your parent through nasal prongs or a mask. Its purpose is to raise blood oxygen in someone a doctor has assessed as needing it; it does not reduce PM2.5 in the room as a whole. The filter on the machine is there to protect the machine itself.

This misunderstanding is dangerous in two ways. First, families may switch the machine on for a parent who has no prescription, or raise the flow themselves to "fight the dust", and too much or too little oxygen is not safe. Second, once they believe the machine is helping, they do not set up a clean-air room or get a proper air purifier, so their parent keeps breathing the same dust.

Easy to remember: an air purifier looks after "the air in the room"; an oxygen concentrator looks after "the oxygen in your parent's blood, as prescribed". One cannot replace the other.

8. Which PM2.5 symptoms need a doctor? A 3-level decision plan

Air4Thai lists unusual symptoms that at-risk groups should watch for: frequent coughing, difficulty breathing, shortness of breath, wheezing, chest tightness, chest pain, palpitations, nausea, unusual tiredness and dizziness. Look at your parent's most serious symptom and follow that level; if you are unsure, treat it as one level higher. If your parent already has a flare-up plan from their doctor, for example for asthma or COPD, follow that plan first.

Go to hospital or call 1669 now

• Chest pain or severe chest tightness
• Too breathless to finish a sentence, or a repeated fingertip oxygen reading of 92% or lower (unless the doctor has set a specific target)
• Bluish lips, tongue or skin
• So drowsy they are hard to wake, or newly confused
• A parent with a tracheostomy who is struggling to breathe, or whose tube seems blocked and cannot be cleared by suction

For what to prepare before calling, see our emergency and 1669 plan for households with older adults.

Call a nurse today

• Coughing more, wheezing or breathing faster than is normal for your parent, while still able to speak in full sentences
• A fingertip oxygen reading below 94% but above 92% with more breathlessness: contact a doctor promptly
• Needing their reliever inhaler more often than the doctor advised
• More phlegm, thicker phlegm or a colour change, especially in a parent with a tracheostomy or who is bedbound
• Unusual tiredness, sleepless nights from coughing, or clearly eating less

The Department of Health, Ministry of Public Health also advises seeing a doctor for severe symptoms, and notes that pollution clinics and the Department of Medical Services' telemedicine service can be used.

Can continue care at home, watch closely

• A mildly irritated throat, stinging eyes or a slightly blocked nose that improves in the clean-air room
• A slight cough without breathlessness, breathing comfortably, eating and sleeping as usual

At this level, keep looking after the clean-air room, check the dust level daily and keep watching. If you have a pulse oximeter, take a reading once or twice a day while your parent is resting; see how to read a pulse oximeter for older adults. If your parent also has a fever, body aches and a cough, it may be more than dust; see flu in older adults: how to care for your parent at home.

Common mistakes families make

• Keeping the windows open all day for fear of stale air On high-dust days, dust builds up in the room your parent stays in all day. Air the room only when the outdoor dust level drops
• Running the oxygen concentrator or raising the flow to "block the dust" It does not purify air, and using oxygen outside the doctor's prescription is not safe
• Buying an air purifier too small for the room and placing it in a room whose gaps have not been sealed, so the result is less than expected
• Burning incense or coil mosquito repellents in your parent's room This adds indoor dust and is very dangerous if your parent uses oxygen
• Sweeping with a broom This stirs the dust back up; use a well-wrung damp cloth instead
• Having a breathless parent wear a fine-filter mask for long periods without asking the doctor, which can make breathing harder

When to bring in a professional team

Most families can set up a clean-air room and check the dust level themselves. But some homes have a parent with a tracheostomy, on oxygen or with lung disease that flares easily, and during high-dust periods someone needs to watch their breathing and phlegm closely. Note that home care does not replace a doctor or the emergency room; if symptoms reach the 1669 level, always call first.

• Registered nurse home visit A registered nurse assesses breathing, listens to the lungs, checks phlegm and the tracheostomy, assesses whether the room and equipment are set up appropriately, and advises when a doctor is needed: THB 1,800 per visit. See home nursing
• Caregiver A caregiver (nursing assistant) provides daily care in the clean-air room, wipes the room with a damp cloth, turns your parent, checks vital signs and keeps a symptom log for the family. A 12-hour shift is THB 1,800 per day, or a live-in 24-hour shift with one caregiver is THB 2,500 per day, minimum 3 days. If your parent needs suctioning or tracheostomy care, the team assigns a caregiver trained in that specially trained care task, working under the supervision of our registered-nurse team, at the same price as a standard caregiver. If breathing symptoms flare or phlegm increases unusually during high-dust periods, have a registered nurse assess your parent first
• Oxygen concentrator (only for parents with a doctor's prescription for home oxygen) Available to rent or buy; a 5-litre model rents for THB 2,500 per month with a THB 8,000 deposit, delivered within Bangkok and its surrounding provinces. See our equipment rental page

Frequently asked questions

What PM2.5 level is dangerous for older adults?

Thailand's standard is a 24-hour PM2.5 average of no more than 37.5 micrograms per cubic metre; above that, Air4Thai shows orange and red. Because older adults are an at-risk group, from yellow (25.1–37.5) they should already wear a mask outdoors, cut down outdoor activity and watch for symptoms.

Does a bedbound parent who never goes out still breathe in PM2.5?

Yes. Dust gets in through doors, windows and gaps, and there is also dust from inside the home, such as incense, mosquito coils, cigarette smoke and cooking. That is why turning your parent's bedroom into a clean-air room matters most for bedbound parents.

How do I set up a clean-air room at home?

Choose the room your parent uses most with the fewest openings, close doors and windows, seal gaps with tape or cloth, run an air purifier sized for the room, wipe surfaces with a damp cloth, take shoes off before entering, and stop incense and other smoke indoors.

What kind of air purifier should I choose for an older parent?

Choose by a CADR large enough for the room: the Department of Health, Ministry of Public Health advises more than 3 times the room's volume (width × length × height), or compare the room area with the size on the box. Pick a unit with a HEPA filter and avoid ones designed to produce ozone. Place it in your parent's room away from curtains, and replace filters as the manual says.

Can older adults wear an N95 mask?

Yes, when they have to go outside on high-dust days, and it should fit the face well. But parents with lung or heart disease, or who are already breathless, should ask their doctor first, because fine-filter masks increase breathing resistance, and a surgical mask may be chosen instead. If it feels uncomfortable or causes dizziness, take it off and rest in the clean-air room; if their lips turn bluish or they are very breathless, call 1669.

Can an oxygen concentrator purify the air or protect against PM2.5?

No. An oxygen concentrator draws in room air and separates out oxygen for your parent as prescribed; it does not reduce dust in the room. Never switch it on or raise the flow because of dust. If you are worried about your parent during high-dust days, call the doctor or nurse.

Talk to the KIN HomeCare team

If your parent starts coughing or getting more breathless during high-dust periods, especially if they have a tracheostomy, use oxygen or have lung disease, and you are not sure whether the room and equipment at home are set up correctly, call and tell us what is happening. Our staff will coordinate with our nursing team to advise which service to start with. A phone consultation cannot replace an examination by a doctor.

• Nurse home visits, caregivers and equipment rental: 061-881-9399 (+66 61 881 9399)
• LINE @KINHOMECARE: you can send a photo of the room or a short clip of your parent's breathing
• Free consultation; the team helps you choose the right service. Outside Bangkok, please ask first whether a team can be arranged in your area

This information is general guidance for families and does not replace advice from your parent's doctor.

Written by Orrathai Boontuang, RN (licence 5311192883) · Medically reviewed by Dr. Kamolchat Choktanomsup (licence 40854) · Prices as of October 2026; please confirm with our staff before booking.