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Table 1 Size distribution of wood dust particles

From: ROS-mediated TNF-α and MIP-2 gene expression in alveolar macrophages exposed to pine dust

  Pine Heat-treated Pine
Number of particles counted 1796 1928
< 1 μm (%) 66.9 65.6
1–5 μm (%) 29.6 30.0
5–10 μm (%) 3.1 3.3
10–20 μm (%) 0.4 0.8
20–50 μm (%) 0.1 0.1
> 50 μm (%) 0 0.1