A typical scenario (an illustrative situation, not a review from any specific customer)

Everything in the house is new, yet her daughter wakes up with red eyes every morning

Prae's two-storey townhouse in the Khlong Chan area of Bang Kapi was one of thousands of homes on Bangkok's eastern side that took in water during the torrential rain of late September 2026. According to news reports, roughly 300 mm of rain fell in about 48 hours, and on 26 September 2026 the Bangkok Metropolitan Administration declared all 50 districts a disaster zone. The water in Prae's house rose well above ankle height and sat there for several days before it could drain away.

When it finally receded, the particleboard wardrobe downstairs had swollen so badly its doors would no longer close. The fabric sofa had wicked water up its legs and smelled musty. The laminate TV unit had buckled into waves, and her six-year-old daughter's mattress, which had been on the living-room floor, had to be thrown away. Prae and her husband replaced almost all the furniture on the ground floor and moved their daughter upstairs into a bedroom with a new wooden bed, a new built-in wardrobe and a brand-new mattress fresh out of its plastic wrap.

Within a week the house looked as if they had just moved in. But every morning, opening the bedroom door released a smell so sharp it stung the nose. Their daughter woke with red eyes and kept rubbing them. Grandma, who had come to help with childcare, said she felt dizzy when folding clothes into the new wardrobe. Prae tried bamboo charcoal, sprayed lavender air freshener and opened the windows during the day, but rain fell almost every afternoon, the air stayed heavy and damp, and the smell stayed with it.

This is far from unusual. During recovery from the 2026 Bangkok floods, many families have replaced a lot of furniture all at once and moved it into closed-up rooms, which makes the problem of new furniture smell and formaldehyde far more noticeable than when people buy one piece at a time in normal circumstances.

Why this flood forced so many homes to replace furniture at the same time

A great deal of modern household furniture is made from engineered wood: particleboard, MDF and plywood. It is affordable and easy to shape, but it has one major weakness. Soaked for long enough, it swells, the board breaks apart internally, the laminate lifts, and it becomes an easy home for mold. Fabric sofas, cushions, mattresses and carpets soaked in floodwater mixed with sewage and mud are also very hard to make safe again, which is why public-health bodies such as the CDC advise discarding porous items that were soaked and cannot be dried within about 24 to 48 hours.

According to news reports, Governor Chadchart said the canals were full and drainage would take two to three days after the rain stopped. As of 30 September 2026, some roads, including Si Burapha and Lat Phrao, still had 20 to 40 cm of standing water. With water lingering that long, ground-floor furniture in many homes was damaged beyond repair. Thai media compared the event with the great floods of 2011, and one Thai business report cited a Chamber of Commerce estimate of around 12,300 million baht in damage, part of which is household belongings that families now have to replace.

The result is that, within a few weeks, a single home may take delivery of several new pieces at once: wardrobes, beds, tables, shelving, sofas and mattresses. The sources of chemical emissions all arrive together in the same space, unlike buying one item at a time, when each smell has a chance to dissipate.

What formaldehyde is, and which parts of furniture release it

Formaldehyde is a colourless chemical with a distinctive pungent smell. It is found in the glues and resins that bind wood chips or fibres into boards, especially the urea-formaldehyde adhesives widely used in particleboard, MDF and some plywood. Once new furniture comes into the house, the chemical slowly off-gasses from the board into the room air.

Where emissions come from in new furniture

• Engineered boards such as particleboard and MDF, especially unsealed inner edges, hinge holes and the backs of cabinets, which are often left uncoated.
• Paints and lacquers on the furniture surface, some containing solvents that are still evaporating in the early days.
• Laminate adhesives and edge-banding glues.
• Foam in mattresses and sofas, which may release other volatile organic compounds with a plastic or chemical smell.
• New upholstery, curtains and rugs that have been through textile finishing processes.
• Plastic wrap and packing foam, which have their own smell if left in the room.

Humidity and heat increase emissions

It is widely known that formaldehyde emissions from engineered wood rise with temperature and humidity. After a flood, homes are still damp, rooms are kept shut because of rain, and many households can't run a dehumidifier everywhere. Those are exactly the conditions that make new furniture smell stronger and last longer than usual.

It also helps to understand that formaldehyde doesn't all leave in one day. It declines gradually over weeks to months, and emissions are generally highest in the early period just after unpacking. That makes the first few weeks the most important time to manage it well.

Health effects, and who needs extra care

Formaldehyde is a chemical that health agencies worldwide take seriously. The World Health Organization has an indoor air quality guideline for it, and the International Agency for Research on Cancer (IARC) classifies formaldehyde as carcinogenic to humans. That is reason enough to keep exposure at home as low as reasonably possible, especially in bedrooms, where we spend many hours every night.

Common short-term symptoms

• Stinging, red or watering eyes
• A burning or blocked nose, sneezing
• Throat irritation and coughing
• Headache and dizziness
• Skin irritation or rash in some people
• Flare-ups of allergies or asthma

Groups who need extra care

• Young children, who breathe faster than adults relative to body weight and spend long hours in their bedrooms.
• Pregnant women and newborns, who should avoid rooms with a strong chemical smell.
• Older adults, especially those with heart or chronic lung conditions.
• People with allergies, asthma or sinusitis.
• Anyone recovering from illness after the flood, whose body has not fully bounced back.

If symptoms are severe, such as difficulty breathing, chest tightness, or symptoms that don't ease after leaving the room, see a doctor promptly. Anyone who waded through floodwater and then develops fever, calf pain, red eyes or diarrhoea should also see a doctor quickly, because these may be signs of a water-borne illness such as leptospirosis, which needs medical treatment. Odour removal and ozone treatment cannot help with that.

The impacts families often don't think about

Health

The bedroom is where we spend more time than anywhere else. Sleeping in a room full of new furniture with the air-conditioning on and windows shut all night can mean hours of continuous exposure. A child who wakes up with red eyes or a stuffy nose every morning can easily be mistaken for having a simple cold.

Sleep and quality of life

After the stress of a flood, everyone needs proper rest, but a sharp smell makes sleep restless. Some families end up all sleeping in one room to escape the odour, which shrinks their living space even further.

Money

Some families assume the furniture is faulty and spend time arranging returns, or buy several air purifiers without knowing how well each model actually handles gases.

Clothes and belongings

Clothes, school uniforms and blankets stored in a new wardrobe that is still off-gassing can pick up the chemical smell and need washing again and again.

Worry

Many parents feel guilty when the new things they bought for their child seem to make them unwell. That worry adds emotional weight at a time when the family is still dealing with everything else the flood left behind.

Why the usual odour fixes only go so far

Air fresheners and room fragrance

They mask the smell for a while but do nothing about what is evaporating from the wood. They also add yet another set of volatile fragrance chemicals, and children who are sensitive to smells may feel worse.

Bamboo charcoal and coffee grounds

They work well in small, closed spaces such as a drawer or the inside of a cupboard. In a bedroom with a new wardrobe, bed and mattress all at once, the amount people put out is rarely enough, and the material saturates quickly without anyone noticing.

Opening windows only in the daytime

Ventilation is the right thing to do and should continue. But when it rains every afternoon and the outdoor air is saturated, it may not be enough, and once the windows are shut at night for the air-conditioning, emissions build up again.

Air-purifying houseplants

Plants make a home pleasant, but in real homes a few pots cannot meaningfully reduce VOCs compared with cutting the sources and ventilating.

Wiping furniture with strong cleaners

Strong-smelling cleaners, or ones containing bleach, don't reduce formaldehyde inside the board and simply add another chemical smell to the room.

Assuming it's gone because you can't smell it

People who live in a room adapt to its smell quickly. Family members may feel the odour has faded while a visitor still notices it clearly. Measuring TVOC gives a far more realistic picture.

The answer: WHD ozone odour and chemical-residue removal

World Health Disinfection (WHD) provides an ozone chemical-residue and odour removal service for homes, condos, offices, hotels and all kinds of buildings. According to the service information, ozone (O3) oxidises odour molecules at the source rather than masking them. It targets paint, thinner, lacquer and epoxy odours, VOCs and musty smells, and also helps reduce bacteria, viruses and mold. Ozone then reverts to oxygen and leaves no residue, and according to the service information the space is ready to use about two hours after treatment.

Why it fits the post-flood new-furniture problem

• TVOC is measured before and after treatment with calibrated instruments, so the family sees comparable numbers for each bedroom.
• It deals with odour that has built up in the air, curtains, upholstery and surfaces, which are the places that hold on to smell.
• It tackles flood mustiness at the same time. Homes that have just been flooded usually have a musty smell mixed in with the chemical one.
• Master Ozone Generator equipment suited to working through a multi-room home.

An honest note before you decide

Formaldehyde still inside the wood continues to off-gas slowly over a long period. Ozone treatment helps reduce the odour and the build-up in the room during the period when the problem is at its worst, but it does not make the board stop emitting forever. Families should keep ventilating, control humidity, and choose low-emission materials for future purchases alongside any treatment.

The process

1. Consultation and survey: which rooms are affected, how many and what kind of new pieces there are, how old they are, and whether vulnerable family members live there.
2. TVOC measurement before treatment in bedrooms, the living room and the strongest-smelling spots.
3. Preparing the home: open all wardrobe doors and drawers, remove plastic wrap, move everyone, pets and plants out of the home, and put away food and drinks.
4. Ozone treatment in an empty, closed space for a duration matched to room size and odour level.
5. Rest and ventilation: ozone reverts to oxygen and the home is aired before anyone goes back in.
6. TVOC measurement after treatment, plus advice on caring for the rooms in the following weeks.

Safety first: ozone treatment is done only in an empty, closed space. People, pets and plants must stay out until the rest and ventilation period is complete. Ozone comes after mud removal, cleaning and drying the home; it does not replace those steps.

10 reasons flood-hit families choose ozone after replacing furniture

1. A child's bedroom should be the safest room in the house. Reducing odour and build-up where children spend the most time is a parent's priority. See the chemical-residue removal service page.
2. It breaks down odour molecules instead of masking them, both in the air and on surfaces.
3. Results in numbers. Before-and-after TVOC readings help you decide whether the room is ready for your child to sleep in again.
4. No residue. Ozone reverts to oxygen and adds no chemicals to beds or clothing.
5. Flood mustiness is handled too. Homes that sat in water often have a hidden musty smell in lower walls and floors.
6. Helps reduce germs at the same time. According to the service information, ozone helps reduce bacteria, viruses and mold.
7. Quick turnaround. According to the service information, the space is ready about two hours after treatment, so the family can run errands for half a day and come back.
8. Reaches every gap: inside wardrobes, behind cabinets, under beds and between drawers where wiping is difficult.
9. Better value than buying several purifiers with no idea of the result, because the outcome is measured.
10. Expert aftercare advice on ventilation, humidity and choosing materials. Contact WHD through the service page or call 065-556-6294.

Example case (a simulated situation to explain the steps, not a verified review)

A Lat Phrao condo where a son rebuilt the bedroom for his 70-year-old mother

Ton, a forty-year-old office worker, lives with his seventy-year-old mother in a ground-floor condo unit in Lat Phrao. Water from the car park flowed into the unit in late September 2026, ruining the lower part of the built-in wardrobe, the bed and the dressing table. After shovelling out mud, washing the room and running a dehumidifier until the walls were dry, he ordered a new set of built-in furniture and had it installed within a few days.

On her first night back in her room, his mother complained of stinging eyes and coughed on and off. Ton moved her to the living-room sofa and contacted WHD. The team asked when the furniture had been installed and whether any inner board edges were left unsealed, and measured TVOC in the bedroom against the living room. They advised opening every wardrobe door and drawer, removing the mattress wrap, and having everyone leave the unit during treatment.

After the rest and ventilation period, the team measured again and explained the results. They recommended opening the windows every morning, keeping the dehumidifier running for the first week, and asking the installer to seal the exposed board edges. Ton says his mother was able to move back into her own room, and he plans to choose furniture labelled as low-emission next time.

This example shows that ozone works best combined with ventilation, humidity control and reducing emission sources, rather than as a single cure-all.

Checklist: reducing formaldehyde and new furniture smell after a flood

Before buying new furniture

• Remove mud, wash the house and let walls and floors dry completely before bringing anything new in; new furniture in a damp room grows mold and emits more.
• After washing, disinfect flood-contaminated surfaces with a medical-grade disinfectant such as Chemgene HLD4H, following the dilution and contact time on the label.
• Ask sellers about the formaldehyde emission standard of the engineered wood and choose low-emission options where possible.
• You don't have to replace everything at once; if you can, bring items in gradually.

When the furniture arrives

• Unpack outside or in a well-ventilated area and take plastic and foam out of the house.
• Leave wardrobe doors and drawers open at first.
• Check for unsealed board edges and drill holes, and ask the installer about edge sealing.
• Keep young children and older relatives out of newly furnished bedrooms until the smell drops.

On treatment day

• Everyone, pets and plants leave the house or unit.
• Remove or tightly store food, medicines and drinks.
• Close windows as the team advises.

After treatment

• Go back in only when the team confirms the rest and ventilation period is over.
• Ventilate daily, especially in the morning, and keep indoor humidity down.
• Wash clothes that picked up the smell before putting them back in the wardrobe.
• Watch family members for symptoms and see a doctor if anything seems wrong.

Frequently asked questions

Will ozone remove formaldehyde permanently?

No. Formaldehyde in the board keeps off-gassing gradually. Ozone helps reduce odour and accumulated substances in the room during the worst period, so ventilation and humidity control should continue alongside it.

Should we wait until all the furniture is installed?

Yes. Finish installation and remove offcuts, packaging and sawdust first so a single treatment covers every odour source.

Can we stay home during treatment?

No. Ozone treatment must be done in an empty, closed space. People, pets and plants must leave and may return only after the rest and ventilation period. According to the service information, the space is ready about two hours after treatment.

Will ozone damage furniture or fabrics?

The team assesses the materials in the room before starting and plans an appropriate treatment time. Any particularly sensitive items will be removed or covered on their advice.

Can a flood-soaked mattress be reused after ozone?

It's not recommended. Mattresses and other porous items soaked in sewage-contaminated floodwater should be discarded, in line with public-health advice. Ozone does not replace throwing away heavily contaminated items.

Can an air purifier do the job instead?

An air purifier is a good everyday helper, but how well it handles gases depends on the filter in each model. Ozone treatment with TVOC measurement tackles the period when the smell is heaviest and shows the result in numbers.

Does ozone prevent flooding or treat allergies?

No. Ozone helps reduce odour and chemical residue during recovery. It doesn't prevent floods and isn't medical treatment. Anyone with symptoms should see a doctor.

Make the new bedroom a place to rest after the flood, not a room that smells of chemicals.

Call 065-556-6294 · LINE @whd268 · worldhealthdisinfection@gmail.com

Related pages

• Ozone odour and chemical-residue removal service
• Residential and building ozone disinfection
• Chemgene HLD4H medical-grade disinfectant

References

• 2026 Bangkok floods (Wikipedia)
• Al Jazeera: Disaster zone declared across Bangkok as heavy rain triggers flooding
• WHO fact sheets
• CDC: Floods