Why all wood dust is hazardous

Wood is a natural material, so it is easy to assume its dust is harmless. It isn’t. Every species makes dust that can irritate your airways, skin and eyes, and some woods also cause allergies or contain irritating or toxic compounds. The good news is that the same habits protect you from almost all of it. This page explains the risks; Protection explains what to do.

Cancer of the nose and sinuses

• The International Agency for Research on Cancer (IARC) classifies wood dust as carcinogenic to humans, its highest category.¹
• The cancers linked to it are in the nasal cavity, the paranasal sinuses and the nasopharynx (the space behind the nose).² The strongest link is to a type called adenocarcinoma of the nose and sinuses.¹
• The evidence comes from people exposed to wood dust at work, usually over many years.¹
• NIOSH treats wood dust as a potential occupational carcinogen.³ ACGIH names oak and beech as confirmed human carcinogens (A1) and birch, mahogany, teak and walnut as suspected ones (A2).⁴

These cancers are uncommon. The point is not to panic but to keep long-term exposure low, whatever wood you cut.

Asthma and allergies

Some wood dusts are sensitizers: your immune system can learn to react to them.

• Wood dust can cause occupational asthma. In the UK, carpenters and joiners are about four times more likely to get it than other workers.⁵ Pooled studies of wood-dust-exposed workers show a higher risk of asthma than in unexposed groups.⁶
• Sensitization does not happen on the first exposure. It usually develops in the first two years of working with a substance, but can appear after decades.⁷
• Once you are sensitized, even very small amounts can set off symptoms, from a runny nose to asthma.⁸
• It may not go away when you stop. In a follow-up of 232 people with western red cedar asthma, about 60% of those who left the industry still had asthma.⁹
• Rhinitis (runny, itchy or blocked nose) and itchy, watery eyes are often the first allergic signs.⁷

Western red cedar is the best-studied example, but many species have confirmed reports. Each species page lists them with an evidence level.

Skin and eyes

• HSE lists dermatitis and irritation of the eyes, nose and throat among the effects of wood dust.¹⁰
• Irritant contact dermatitis usually starts as dry, red, itchy skin. Allergic contact dermatitis looks similar but is an immune reaction: once you have it, tiny amounts trigger it again.¹¹
• Some woods are also reported to cause hives, slow-healing splinter wounds, or sensitivity to sunlight.¹² See Skin and eyes.

Lung inflammation and toxic effects

• A few woods, including western red cedar and iroko, have rarely caused hypersensitivity pneumonitis, an allergic inflammation deep in the lungs.¹² One case from ramin dust was reproduced by an inhalation challenge.¹³
• HSE lists some timbers with effects beyond the lungs and skin, such as vomiting, headache or heart effects, for example yew, greenheart and padauk.¹²
• Wood dust can also carry bacteria and fungal or moss spores.¹⁰

Fine dust matters most

• The biggest risk is fine dust, because you can breathe it deep into your lungs and it spreads further from the tool.¹⁰
• Sanding makes fine dust; sawing, turning and routing make coarser dust.⁸ All of them are among the jobs with the highest dust exposures.¹⁰
• Airborne fine dust is normally invisible. A clean-looking shop is not proof of clean air.¹⁰
• Settled dust contains the fine particles most likely to damage the lungs, so sweeping and blowing it around puts it back in the air.⁵
• Exposure adds up. Higher cumulative exposure has been linked to more asthma symptoms.⁶

Fire and explosion

Wood dust burns, and a cloud of it can explode.¹⁰ Many shop fires start inside dust extraction equipment.¹⁴ OSHA lists wood among combustible dusts.¹⁵ An explosion in a collector can shake settled dust loose and set off a second, larger one.¹⁶ See Fire and explosion.

No wood is “safe”

A wood with few reports is not a safe wood. Absence of reports is not evidence of safety, and HSE notes that woods missing from its list may also be harmful.¹² Treat every species as hazardous and control the dust.

What to do next

• Read Protection for the one-screen checklist.
• If you have symptoms, read Symptoms.
• Look up your wood on its species page for specific reports.

Last reviewed 2026-11-07.