WEL Substance Profile

Wood Dust — Workplace Exposure Limit Change

CAS: Not applicable (natural material) | Notation: Inhalable fraction, hardwood dust carcinogen (IARC Group 1)

Current WES

mg/m³

New WEL (Dec 2026)

0.5

mg/m³

Change

-50%

reduction

Health Effects

Hardwood dust is classified as a Group 1 carcinogen by IARC, with sufficient evidence of causing nasal adenocarcinoma and sinonasal cancer in humans. The cancer risk is specific to hardwood species including oak, beech, birch, mahogany, teak, and walnut, although mixed dust environments containing both hardwood and softwood are treated as carcinogenic. Beyond carcinogenicity, wood dust causes occupational asthma through both allergic and irritant mechanisms, with species such as western red cedar, iroko, and ramin being particularly potent sensitisers. Chronic rhinitis, nasal mucosal changes, and decreased lung function are common among workers with prolonged dust exposure. Dermatitis from skin contact with wood dust and wood preservative chemicals adds to the health burden. Softwood dust, while not classified as carcinogenic, causes the same respiratory and dermal effects.

Where Exposure Occurs

Carpentry and joinery workshopsTimber framing and formwork on construction sitesFurniture manufacturing and restorationSawmilling and timber processingFloor sanding and finishing operationsWood turning and carving workshops

What to Do Now

01Conduct inhalable dust air monitoring at all woodworking operations including sawing, routing, sanding, planing, and drilling. Use an IOM inhalable sampler to capture the inhalable fraction, as standard respirable cyclone samplers underestimate wood dust exposure. Compare results against the incoming 0.5 mg/m³ WEL to identify tasks requiring additional controls.

02Upgrade dust extraction systems on all fixed woodworking machinery. Each machine should have dedicated extraction connected to a central dust collection system or individual extraction unit with HEPA filtration. Extraction hoods must be positioned to capture dust at the point of generation. Portable and handheld tools should use on-tool extraction connected to an M-class or H-class vacuum.

03Implement housekeeping procedures that prevent secondary exposure from settled dust. Compressed air blowdown must be prohibited — it re-entrains settled dust and creates exposure peaks far above the WEL. Vacuum cleaning with HEPA-filtered equipment and wet wiping are the only acceptable dust removal methods. Establish a cleaning schedule with defined frequencies for floors, surfaces, and overhead structures.

04Provide health surveillance for all wood dust-exposed workers including baseline and periodic lung function testing, nasal examination, and respiratory symptom questionnaires. Workers handling known sensitising species such as western red cedar should receive more frequent monitoring and be assessed promptly if any respiratory symptoms develop.

05Review work practices to minimise dust generation. CNC machining with integrated extraction generates less ambient dust than manual machining. Pre-cut timber packages reduce on-site cutting. Sanding operations should use the coarsest grit effective for the application, as finer grits generate more inhalable dust per unit of material removed.

Monitoring Method

Personal air sampling using a calibrated pump at 2 L/min with an IOM inhalable sampler and pre-weighed 25mm glass fibre filter. Gravimetric analysis following AS 3640. The IOM sampler is the preferred device for wood dust as it captures the inhalable fraction that deposits in the nasal passages where carcinogenic effects occur.

Affected Industries

Construction →

Control Wood Dust Below the New 0.5 mg/m³ Limit

EHS Atlas tracks wood dust monitoring data, manages extraction system maintenance schedules, and documents health surveillance for exposed workers in carpentry and joinery operations.