Can sawmill work involve wood dust and other site-specific exposures without identifying the source of antimony or tin?

Sawmill employment is a credible setting for several exposures, but the exposure profile is driven by the specific materials processed and tasks performed—not the job title alone. This distinction is especially important when investigating antimony or tin.

Clinical and exposure evidence

• Wood dust is the best-established exposure. Across sawmills, inhalable-dust geometric means were approximately 0.8–2.5 mg/m³, with greater concentrations around chippers, saws, planers, and sanding equipment. In one survey, sanding had a median 8-hour exposure of 3.2 mg/m³, with substantial numbers of measurements above 3 and 5 mg/m³.
• Treated wood can materially change dust composition. Cutting, sanding, or routing CCA-treated wood produces dust containing arsenic, chromium, and copper. During indoor sanding, mean breathing-zone concentrations were 342 µg/m³ arsenic, 345 µg/m³ chromium, and 170 µg/m³ copper.
• Fuel contact, lubricating-fluid/oil-mist exposure, and metal-containing dust or fume from machinery maintenance, grinding, welding, or sharpening are occupationally plausible, but their magnitude must be established at the individual facility.

Mechanistic and attribution considerations

• Antimony is not a usual product of cutting untreated wood; potential site-specific sources include combustion or ash, reclaimed or flame-retardant-treated wood, and maintenance processes such as welding, soldering, or saw sharpening.
• Tin likewise has no characteristic sawmilling source and may originate from alloys, solder, coatings, pigments, recycled inputs, or combustion residues. Preservative-related arsenic, chromium, or copper does not establish antimony or tin exposure.

Clinical implications

• Source attribution should use process and material inventories, task timing, duration, and controls, coupled with contemporaneous personal air sampling, targeted area/source and bulk-material testing, and—where relevant—chemical speciation. Biomonitoring can demonstrate internal dose but requires linkage to work tasks and air measurements.

Bottom line

• Sawmill work clearly entails wood-dust exposure and may involve treated-wood, fuel, lubricant, and machinery-related contaminants; however, occupation alone cannot identify the source of antimony or tin.