In brief
Work involving exposure to hardwood dust falls within the scope of the Regulation on Work with Carcinogens or Mutagens, and the eight-hour limit value is 5 mg/m³; however, the aim is not to stay below this value but to reduce exposure to the lowest possible level. The way to do this is extraction hoods that capture dust at the machine, a correctly sized dust extraction system and cleaning by vacuum instead of compressed air. Health surveillance of employees in dusty departments is planned so as to catch respiratory and nasal complaints early.
Why is wood dust a separate health issue?
In a furniture workshop, the visible wood chips are the least worrying part from a health point of view. The real risk is the fine wood dust generated during panel sizing, routing and especially sanding, which stays suspended in the air for a long time. This dust reaches the nasal cavity, the sinuses and the lungs through breathing; it can also irritate the skin and eyes.
The effect of wood dust varies with the type of wood and the type of process:
- Hardwoods (broadleaved trees such as oak, beech and walnut) are regulated separately in the legislation because of their carcinogenic effect.
- Softwoods (conifers such as pine and fir) can also cause respiratory irritation and, with some species, allergic complaints.
- In boards such as MDF and chipboard, the wood fibre is accompanied by binding resins; sanding produces a very fine dust.
Most woodworking businesses in Bursa, led by the workshops in and around the İnegöl Furniture and Woodworking Specialised OIZ (organised industrial zone), process all three materials on the same line. That is why "wood dust" should not appear as a single line in the risk assessment; which material is processed on which machine should be written down separately.
Is wood dust carcinogenic? What does the legislation say?
Yes, for hardwood dust the answer is clear. Annex 1 of the Regulation on Health and Safety Measures for Work with Carcinogens or Mutagens lists "work involving exposure to hardwood dust" among the processes within its scope. The International Agency for Research on Cancer (IARC) also classifies wood dust as carcinogenic to humans (Group 1); the diseases most associated with it are cancers of the nasal cavity and sinuses.
The basic rules the Regulation sets for wood dust are:
| Subject | Provision in the Regulation |
|---|---|
| Limit value | 5 mg/m³ as an 8-hour reference for hardwood dusts (Annex 2) |
| Mixed dust | If hardwood dust is mixed with other wood dusts, the value applies to the whole mixture |
| Order of measures | First substitution, if not possible a closed system, and if that is not possible either, reducing exposure to the lowest level (Art. 7) |
| Control at source | Removing dust at source by local or general ventilation (Art. 7/1-d-4) |
| Cleaning | Regular cleaning of floors, walls and surfaces (Art. 7/1-d-8) |
| Records | The list of exposed persons and health records are kept for at least 40 years after exposure ends (Art. 17) |
The limit value in the table is not a "safe threshold". The Regulation says exposure may not exceed the limit value, but it also requires the lowest possible level to be the target. Postponing extraction improvements because your measurement came out below 5 mg/m³ goes against the logic of the Regulation. For the general framework of working with carcinogens, see our article on carcinogenic and mutagenic substances.
MDF dust and health: points to watch
MDF dust needs to be considered separately for two reasons. First, sanding and routing MDF produces finer dust than solid wood; fine dust stays in the air longer and reaches deeper into the respiratory tract. Second, the board contains binding resins in addition to wood fibre. Find out the board's composition and the substances that may be released during processing from the supplier's safety data sheet or technical data sheet, and enter them in the risk assessment.
Health effects frequently seen on site are:
- Signs of irritation such as runny nose, congestion, sneezing and watery eyes.
- Coughing and shortness of breath; occupational asthma with some wood species. For details see our article on occupational asthma.
- Skin complaints such as redness and itching on the hands and arms.
- Nasal and sinus complaints in employees who have breathed hardwood dust for many years; one-sided, persistent nasal congestion or recurrent nosebleeds must always be reported to the physician.
You can match dust sources and priority measures by machine as follows:
| Source | Nature of dust | Priority measure |
|---|---|---|
| Panel sizing and circular saw | Coarse chips and fine dust together | Extraction below and above, extraction from the blade guard |
| Planer and thicknesser | Mainly chips | High-flow extraction connection, emptying full bags on time |
| CNC router | Fine dust and chips | Brush extraction hood around the tool, under-table extraction |
| Belt and hand sanders | The finest dust | Extraction at the machine, hand sanders with extraction |
| Cleaning with compressed air | Re-suspends settled dust | Prohibit it; use an industrial vacuum |
| Cyclone and filter emptying | Intense short-term exposure | Enclosed emptying, PPE during emptying |
Chip extraction: capturing dust at the machine
Annex I, item 2.5.1 of the Regulation on Health and Safety Requirements for the Use of Work Equipment requires work equipment that presents a dust hazard to be fitted with suitable systems to contain or extract the dust at source. What determines whether chip extraction is effective is how close the extraction hood is to the point where the dust is generated. General hall ventilation dilutes fine dust but does not remove it from the worker's breathing zone.
Look at the following for extraction at the machine:
- Manufacturer data: Each machine's user manual states the extraction connection diameter and the required air flow. The dust extraction system must be selected to match these values; the "we connected the hose left over from the old machine" approach is usually inadequate.
- Hood design: On saws, extraction is taken from both below the table and the blade guard; on CNC routers, from a brush hood surrounding the tool.
- Dampers: The damper of an idle machine should be closed and that of a running machine open. If all dampers are left open, extraction is divided between all machines and is sufficient on none of them.
- Flexible hoses: Long, sagging and crushed hoses reduce extraction. Keep hose lengths short and replace torn hoses immediately.
- Hand tools: Models with an extraction connection and mobile dust extractors are used for hand sanders and hand routers.
How is a dust extraction system set up in furniture manufacturing?
A central dust extraction system connects the extraction hoods at the machines by ducts to a fan, cyclone and filter unit. Treat the installation as an engineering project and follow this sequence:
- Machine inventory: List the machines to be connected to the system, their extraction requirements and how many machines will run at the same time.
- Duct design: The duct route should be short and bends should be wide-angled. The air velocity in the duct must be calculated so that dust does not settle in it; settled dust both reduces extraction and creates a fire load.
- Filter and cyclone location: The unit is placed outside the building where possible. Because a dust cloud is constantly present in the cyclone and filter, explosion venting and ignition prevention devices are designed in; details are in our article on dust explosion risk.
- Earthing: Metal ducts and the filter housing are earthed and equipotential bonding is provided.
- Return air: If air passing through the filter is returned to the hall, the filter efficiency must be chosen to suit this use.
- Commissioning: When the system is started, the flow at every extraction hood is measured and recorded. This first measurement is the reference point for later checks.
- Maintenance plan: Filter cleaning, cyclone and bag emptying and hose checks are tied to a schedule.
Adding a new machine to the workshop does not mean growing the system by opening "one more hood". Every addition divides the total flow; have the system's capacity recalculated before adding a new machine. For other items to check on site, you can use our furniture workshop OHS checklist.
Workplace measurement and health surveillance in dusty areas
Whether the extraction system works is shown by personal dust measurements taken from the air the worker breathes. Measurements must be carried out by laboratories holding a certificate of competence from the Ministry's Directorate General of Occupational Health and Safety; Bursa Sistemer plans measurements with authorised laboratories and healthcare providers and enters the results in the risk assessment. For general obligations regarding dust, see our article on the Dust Control Regulation.
Under Art. 16 of the Carcinogens Regulation and Art. 15 of Law No. 6331, health surveillance is carried out before exposure begins and at regular intervals afterwards. A practical programme for departments with wood dust can be set up as follows:
- Pre-employment: Respiratory and skin history, questions on allergy and asthma, nasal examination. The physician decides on the necessary tests.
- Periodic examination: Furniture manufacturing such as bedroom and kitchen furniture (31.00.01) is in the hazardous class; periodic examinations are carried out at least every 3 years. For employees exposed to carcinogens, the workplace physician can shorten this interval.
- Tests: The legislation sets no fixed frequency for lung function testing; the physician decides according to exposure. For dust exposure, chest X-rays are taken to the ILO standard, again at a frequency set by the physician.
- If findings emerge: If a health problem is found to result from exposure, the Regulation requires the risk assessment to be reviewed and, if necessary, the employee to be assigned to other work without exposure (Art. 16/2).
We plan tests with authorised healthcare providers and keep the results in the health surveillance file in line with the 40-year retention rule. The 2026 base administrative fine for not carrying out health surveillance is 22,194 TL per employee. You can track examination and measurement dates with the OHS calendar tool.
Dust masks: the last line of defence
Once extraction and cleaning measures are in place, respiratory protection is used for the remaining exposure. For carcinogenic dusts such as hardwood dust, class FFP3 is preferred; for the mask to seal on the face, a clean shave and a face fit check are needed. For class selection and service life, see our article on FFP1, FFP2 and FFP3 dust masks. Do not use the mask in place of extraction: on a sanding machine without working extraction, the mask hides a deficient system.
We describe dust-related risks in furniture and woodworking businesses on our sector page (furniture), and our service arrangements in İnegöl on the İnegöl OSGB page.
Frequently Asked Questions
Is MDF dust carcinogenic?
Annex 1 of the Regulation lists work involving exposure to hardwood dust. MDF may contain hardwood fibre, and substances from binding resins must also be assessed separately. Ask for the board's safety data sheet and manage machines processing MDF under the hardwood dust rules.
What is the limit value for wood dust?
The 8-hour limit value for hardwood dusts is 5 mg/m³. If hardwood dust is mixed with other wood dusts, the value applies to the whole mixture. Because it is carcinogenic, the target is not to stay below the value but to reduce exposure to the lowest possible level.
Is a dust mask needed if there is chip extraction?
Extraction removes most of the dust at source, but exposure can continue, especially in work such as sanding, cleaning and filter emptying. Whether a mask is needed is decided on the basis of measurement results and the risk assessment; for carcinogenic dust, the suitable class is usually FFP3.
How often are employees in dusty departments examined?
Because furniture manufacturing is in the hazardous class, periodic examinations take place at least every 3 years. For employees working with carcinogenic dust, the workplace physician can shorten this period; the physician also sets the frequency of lung function tests and chest X-rays according to exposure.
An exposure-based test plan, pre-employment and periodic examinations, confidential health files and an examination schedule tracked per person.
Bursa SİSTEMER OSGB Technical Team — written from the field experience of our OHS specialists and workplace physicians. Legal information is valid as of the publication/update date; contact us for an assessment specific to your business.