Abstract: Nine samples of test dust in the wide particle size range of 1.7～19.4 μm ( D₅₀) with cumulative particle size distribution percentages of up to 50% were prepared by applying grinding, sieving, sedimentation separation to the Arizona (ISO12103-A2) test dust. The Malvern laser particle size analyzer was used to characterize the particle size distribution of the samples. Repeatability tests showed that the developed Arizona test dust in each particle size range is reproducible.