An Accounting Office Beside a Car Body Shop: 7 of 12 Staff Called In Sick During Closing Season and 38 Company Filings Stalled, Because of Car Paint Smell From the Shop Next Door

Car paint smell from the shop next door travels through a shared shophouse wall far more easily than most people expect. Here is what that smell actually is, and how ozone paint odour treatment with the Master Ozone Generator clears what has already soaked into an office.

Three Weeks of Closing the Books in a Cloud of Thinner

This story is a composite based on situations we commonly see; names and places are fictional.

For anyone in accounting, April and May are the heaviest weeks of the year. Corporate clients need their financial statements closed and their tax filings submitted on time, and every person in the office has to concentrate. This year, one small practice had to do all of that while car paint smell from the shop next door leaked through the wall every single day.

Waraporn, 49, has run her accounting practice out of a four-storey shophouse in the Phasi Charoen district of Bangkok for 16 years. She has 12 staff and looks after more than 140 clients. The second floor holds the accounting team's desks; the third floor is a meeting room and an archive where client files are packed tight onto steel shelving.

In early January, the unit next door changed hands and reopened as a panel-beating and respray workshop run by Moo, 41. The front of the unit was for dent work and body filler; at the back, a plastic tarpaulin marked off a makeshift spray corner, vented by a 16-inch extraction fan blowing straight into the rear service lane. That lane is the same one Waraporn's office windows face.

Week one: a sweet, sharp smell everyone assumed would pass

The first three months were tolerable because the workshop was quiet. By April it was taking three to four insurance repair jobs a day, and every afternoon a sweet, solvent-sharp thinner smell drifted up to the second floor. On bad days you could smell it from the stairwell.

Praew, the 34-year-old team leader who was five months pregnant, was the first to say she felt dizzy and nauseated every afternoon. Ton, a 24-year-old assistant accountant with asthma, found himself reaching for his inhaler almost daily. Waraporn bought two more air purifiers and put bags of charcoal around the desks. The smell stayed.

Week two: the sick notes start arriving

Within ten days, 7 of the 12 staff had taken sick leave totalling 16 working days. The complaints were almost identical: headaches, stinging eyes, sore throats. Praew was advised by her doctor to work from home, while the year-end filings for 38 client companies sat unfinished. The remaining team worked overtime until nine most nights, and four people ended up renting desks in a nearby co-working space for nine days. Unplanned costs passed 40,000 baht, not counting the time spent carrying boxes of files back and forth.

Week three: clients notice, and the neighbours fall out

An online clothing retailer collected a box of documents and messaged that evening: "I opened the box at home and the thinner smell hit me." It was said lightly, but Waraporn knew that in a business built on credibility, small impressions matter.

On Friday afternoon she knocked on the workshop door carrying weeks of accumulated frustration. The conversation ended with both sides shouting. That night she sat wondering whether to file a nuisance complaint with the district office, even though she did not want a running feud with a neighbour she would see every morning.

What she worked out that night was that the problem had two halves, each needing a different fix: the source that keeps producing fumes every day, and the odour and solvent vapour already soaked into her own office.

Car Paint Smell From the Shop Next Door Costs More Than Comfort

When a chemical smell appears daily in a room where people sit for eight to ten hours, the damage spreads across health, money, reputation and relationships at the same time.

1. The health of everyone in the office

• Headaches, dizziness and nausea, worst in the afternoon when vapour has built up all day.
• Irritated eyes, nose and throat, which forces constant breaks in work that involves staring at numbers.
• People with asthma or allergies may find their symptoms flaring more often.
• Pregnant women, older people and anyone with a chronic condition should avoid solvent exposure in particular, and prolonged exposure indoors is not something to shrug off as "you get used to it".

2. Money and time lost in the most expensive weeks of the year

• Sick days during peak season create backlogs and push up overtime costs.
• Temporary workspace rental, extra travel, and the cost of moving documents around.
• The risk of missing statutory filing deadlines, plus a higher chance of keying errors when nobody can concentrate.

3. Reputation in front of clients

• Clients smell solvents the moment they walk in, and start quietly questioning how professional the practice is.
• Files and document boxes absorb odour, so the smell travels home with the client.
• External auditors and partners may postpone visits to the office.

4. Trust inside and outside the business

• Staff start to feel their employer is not protecting them, and a few begin browsing job listings.
• A dispute with a neighbour you see every day can escalate into formal complaints and years of bad blood if it is handled badly.
• Families of pregnant or vulnerable staff begin asking them to find somewhere else to work.

What Is That Smell Crossing the Wall, Exactly?

Automotive refinishing is never a single product. Every panel goes through several stages, and each stage releases a different mix of volatile organic compounds (VOCs). That is why the smell from a body shop is part sweet, part acrid and part warm plastic all at once.

What goes into the smell

• Body filler and primer, used to level dents before spraying. These carry solvents, and some filler systems contain styrene with its distinctive sharp odour.
• Basecoat, which is thinned before spraying. Automotive thinners typically combine several solvents such as toluene, xylene and acetate esters.
• 2K clearcoat, a polyurethane topcoat mixed with a hardener containing isocyanates, which irritate the airways and can trigger symptoms in sensitised people.
• Gun-wash thinner, used to clean spray equipment after every job. It is a major vapour source that many workshops overlook entirely.

How the smell reaches a desk two floors up

Older shophouses are built on shared party walls. Along beam lines and wherever pipes were cut through, there are usually hairline cracks and small gaps, and the void above suspended ceilings is often continuous between units. When spraying happens without a properly enclosed booth, overspray and vapour fill the whole unit and seep through those openings. The extraction fan blowing into the rear lane only moves the vapour into a narrow, poorly ventilated alley, where it drifts back in through windows, vents and the gaps around air-conditioning pipework.

Why the office still smells after the spraying stops

An accounting office is full of highly absorbent material: thousands of paper files, fabric-covered partitions, carpet tiles, curtains, upholstered chairs and gypsum ceiling board. These materials hold solvent vapour inside them, then release it slowly back into the room as the temperature rises or when the air conditioning goes off. That slow release is called off-gassing.

It is why Monday morning still smells sharp even after a quiet Sunday next door, and why fixing the source alone is not enough. The odour already stored in the building has to be dealt with separately.

Why the Usual Remedies Do Not Work Here

Waraporn tried nearly everything an ordinary person would think of, and each attempt helped only partially.

1. Open the windows and run fans. This only works when outdoor air is cleaner than indoor air, and in this case the rear lane was exactly where the vapour was pooling. Opening up could actually pull more of it in, and even for pure residual odour, natural ventilation takes days or weeks.
2. Air freshener and scented sprays. These mask the smell for an hour or two. The solvent vapour is still in the air, and some people get worse headaches from breathing two competing smells.
3. Charcoal and baking soda. Their absorption capacity is tiny compared with the air volume of an entire shophouse floor, and they saturate very quickly.
4. Domestic air purifiers. They are designed for small rooms, and their carbon filters saturate fast against a heavy solvent load, so replacement costs mount up with limited benefit.
5. Relocating staff temporarily. It relieves the symptoms but does nothing about the smell, costs money every day, and moving client files around adds real risk of loss.
6. Confronting the neighbour with no concrete proposal. This usually ends in conflict, because the other side feels accused without being told what to change or what it will cost.

The conclusion is that the problem has two layers. First, control the source with a proper spray booth and extraction. Second, break down the odour and solvent residue already stored inside the office, with measurable evidence that it worked.

The Fix: Deal With the Source, Then Ozone-Treat Your Own Side

Step 1: Get the source under control first

If the workshop next door keeps spraying in the open, any odour treatment on your side will be undone within a day. These are the points worth raising calmly:

• A properly enclosed spray booth with extraction, paint arrestor filters, and a duct discharging above roof level rather than into a lane lined with other people's windows.
• Sealing cracks and gaps along the party wall, beam lines and the ceiling void, ideally coordinated through the building owner.
• Proper chemical respirators for the sprayers, which protects the workshop's own staff first of all.
• An agreed way to raise problems, such as a small group chat, so issues get mentioned early instead of building into resentment.

Step 2: Ozone treatment for what is already in the building

Once the source is controlled, what remains is the odour and VOCs stored in paper, fabric, carpet and ceiling board. That is the job of the paint odour and chemical residue ozone service from World Health Disinfection (WHD), using the Master Ozone Generator.

The machine releases ozone (O₃) into a sealed space, mimicking the way nature purifies air. Ozone is highly reactive: it oxidises and breaks the molecular bonds of odour compounds, chemical vapours (VOCs) and germs at source. That destroys the odour rather than masking it. Afterwards the ozone naturally decomposes back into oxygen (O₂), leaving no chemical residue behind.

Because ozone is a gas, it reaches the corners nothing else can — between packed shelves of files, behind partitions and above the ceiling — where wiping down and air purifiers simply cannot go, and it covers large areas in a single cycle.

Measured TVOC before and after, not just a nose test

What sets WHD apart is measuring TVOC (Total Volatile Organic Compounds) with an AM1310 meter both before and after treatment, on the actual job site. The instrument is backed by calibration paperwork, including a KIMO PT100 SC0110 adjusting certificate and a BR-SMART certificate of calibration. WHD is one of the few providers in Thailand that shows TVOC reduction results measured at real job sites, and most areas are ready to use within about two hours once the cycle and ventilation are complete.

Safety comes first: ozone treatment is carried out by trained technicians in a closed, unoccupied space. People, pets and plants must be out of the area for the whole cycle, and after it the ozone is left to decompose and the space is ventilated before anyone re-enters. Technicians assess the site and remove or cover ozone-sensitive items such as artwork, natural rubber and delicate electronics.

10 Reasons an Office Next to a Body Shop Should Choose WHD

1. It breaks odour down at molecular level

Ozone attacks the structure of the odour compounds themselves, so thinner and lacquer smells genuinely drop instead of being covered by fragrance that wears off overnight.

2. It reaches between thousands of files

The archive is where odour clings hardest, because paper absorbs vapour readily. Ozone chemical residue treatment works as a gas that penetrates every gap, including places a damp cloth will never reach.

3. Before and after TVOC readings from the real site

The team measures TVOC with calibrated equipment before starting and after finishing, so an office owner has something concrete to show anxious staff and to discuss reasonably with a neighbour.

4. It can be done outside business hours

WHD can schedule the treatment for an evening or a weekend while the office is empty, so nobody loses a working day during the weeks when every day counts.

5. Usually usable again within about two hours

After the cycle, the ozone decomposes back into oxygen and the space is ventilated. Most areas can be handed back within roughly two hours, so there is no need to close for days.

6. No chemical residue on desks or documents

Ozone reverts to oxygen naturally, unlike sprayed deodorising liquids that can leave marks or a new smell on paper, keyboards and every surface staff touch daily.

7. Every floor covered in one visit

Technicians position the Master Ozone Generator according to the volume of each floor, from the ground-floor counter to the accounting desks and the archive above.

8. It tackles the musty smell that comes with it

Older shophouses sealed up against paint fumes often develop a stale, musty problem instead. The WHD ozone paint odour service helps reduce musty odour, germs and mould in enclosed spaces at the same time.

9. Technicians who assess safety every time

Before starting, the team surveys the site, advises on storing ozone-sensitive equipment, keeps the area clear of people, and only reopens it after the ventilation stage is complete.

10. Experience across many kinds of paint odour

From condominium bedrooms and living rooms to office meeting rooms, car paint spraying and chemical industrial plants, the WHD team has handled acrylic and oil-based paint, epoxy, PU, thinner and lacquer odours. See the full service details on the service page.

Before and After: Extraction Talks Plus Ozone Treatment

How the WHD Team Works

1. Site survey and TVOC reading before treatment. The team assesses the area, finds the strongest odour points, and checks whether the source has actually been brought under control.
2. People, pets and plants out of the area, with ozone-sensitive items such as artwork, natural rubber and delicate electronics stored away or covered.
3. Seal the area and set up the Master Ozone Generator. Windows, doors and vents are closed and the units positioned appropriately on each floor.
4. Run a cycle sized to the room volume, matched to the area and the severity of the odour.
5. Allow decomposition and ventilation. The ozone reverts to oxygen naturally, and nobody enters during this stage.
6. Re-check TVOC and odour, comparing against the pre-treatment reading so the owner can see the result.
7. Hand the space back, typically ready to use within about two hours, with advice on keeping it that way.

How the Story Ended: From a Shouting Match to a Shared Coffee

On Monday morning Waraporn asked Sunee, the building owner, to arrange a three-way conversation. This time she came prepared rather than angry, with the count of sick days and an example of a booth design with a roof-level exhaust duct. Moo went quiet for a moment, then admitted his own eyes stung every evening too.

The agreement was simple. Moo would build an enclosed booth with arrestor filters and a duct above roof level, sending respray work to a friend's workshop during the twelve days of construction. Sunee would have the cracks in the party wall and ceiling void sealed. Waraporn would take care of the odour already embedded in her own office.

Once the booth was finished, almost no new smell came through, but the archive and the carpet still held the old one. Waraporn booked the WHD ozone paint odour treatment for a Saturday morning with the office closed. The team took a TVOC reading first, advised her to shut down computers and put sensitive documents away, then treated the building floor by floor. The afternoon re-check showed a clear drop, and the space was handed back the same day.

The following Monday, Praew was back at her old desk and Ton said breathing felt easier. The smell had not vanished entirely on day one, since some materials were still releasing traces, but it was different enough that nobody needed sick leave again. There were still late nights, but all 38 client filings went in on time.

Preventing This Next Time

• Before renting or buying a shophouse, ask what the neighbouring units are used for, and walk the rear lane in the afternoon.
• Seal cracks and gaps in the party wall, the ceiling void and around air-conditioning pipework from day one.
• Choose finishes that hold less odour, such as wipeable hard surfaces instead of carpet and fabric partitions, and store files in closed cabinets rather than open shelving.
• Talk to the neighbour as soon as the smell starts, with a clear proposal, before resentment builds up on both sides.
• If you are renovating your own office, specify low-VOC paints and adhesives, allow proper curing time, and schedule an ozone treatment before staff return.

Frequently Asked Questions

Do we have to leave the area during treatment?

Yes. People, pets and plants must stay outside for the whole cycle, and you only return once the ozone has decomposed and the space has been ventilated.

How long does it take?

It depends on the size of the space and how strong the odour is. Areas are generally ready to use within about two hours after the cycle, and a multi-storey office is usually finished in a single day.

Does ozone leave a residue?

Ozone decomposes naturally back into oxygen and leaves no chemical residue. The team always allows time for decomposition and ventilation before handing the space back.

What size of space is it suitable for?

Anything from a condominium bedroom or meeting room to a whole shophouse or an industrial plant, because the cycle is sized to the actual volume of the space.

If the workshop is still spraying, will the smell come back?

It can. The source has to be controlled first, with an enclosed booth and proper extraction. Ozone treatment then clears the accumulated odour, scheduled when the space is empty.

What about documents and computers?

The technicians assess each site and advise case by case, typically switching off electrical equipment, putting important documents in cabinets, and covering anything delicate.

Is there evidence the odour actually dropped?

WHD measures TVOC with a calibrated AM1310 meter, both before and after treatment, at the real job site.

Read More

• Ozone cleaning service
• Residential ozone disinfection
• Disinfection spraying service
• US EPA: VOCs and indoor air quality
• WHO: air quality and health

Still Smelling Paint From Next Door? Talk to WHD

Ozone paint odour and chemical residue treatment outside business hours, with before and after TVOC readings from your own site.

Tel 065-556-6294 · LINE @whd268 · worldhealthdisinfection@gmail.com
88/268 Kanlapaphruek Road, Bang Khae, Bangkok 10160