Wood Dust Monitoring

Sawing, planing, routing, mortising, and sanding of hardwood species generates fine inhalable dust. Australian hardwoods (eucalyptus species) and imported tropical hardwoods produce dust classified as IARC Group 1 carcinogenic. CNC router operations on hardwood generate high dust emission rates requiring effective LEV capture at the tool head.

MDF, particleboard, and plywood contain urea-formaldehyde or phenol-formaldehyde resin binders. Cutting, routing, and sanding these materials releases both wood dust and formaldehyde vapour simultaneously. Formaldehyde is an IARC Group 1 carcinogen with a WES of 0.3 ppm STEL (no TWA). Co-monitoring for dust and formaldehyde is required when MDF is processed.

Pine, spruce, and other softwood species have a higher WES of 5 mg/m³ but can still cause occupational asthma through sensitisation. Western Red Cedar is a potent respiratory sensitiser with a specific WES of 0.5 mg/m³ inhalable TWA. Species identification is important for applying the correct WES value.

Dust extraction systems in woodworking workshops require periodic verification of capture velocity, transport velocity, and filter efficiency. Poorly maintained LEV with blocked ducts, worn fan impellers, or full collection bags allows dust to accumulate in the workshop atmosphere. LEV testing and air monitoring should be conducted together to correlate system performance with worker exposure.

Typical Worker Groups

Common similar exposure groups (SEGs) assessed for this sub-category.

Regulatory Context

The WHS Regulation requires PCBUs to ensure worker exposure to wood dust does not exceed the WES. Health monitoring is required for workers with significant exposure to hardwood dust, softwood dust, or formaldehyde under Schedule 14 of the WHS Regulation. Monitoring must include respiratory function testing (spirometry) and a clinical assessment. The Workplace Exposure Standards for Airborne Contaminants list separate WES values for hardwood, softwood, and Western Red Cedar. When wood species cannot be identified with certainty, the hardwood WES of 1 mg/m³ must be applied as the default. LEV systems for woodworking must be designed, installed, and maintained in accordance with relevant standards and verified by periodic testing.