The thesis deals with laser particle size analysis of selected exotic wood dust considered on the risk of explosion. Experimental samples represent dust particles from exotic woods Zebrano (Microberlinia brazzavillensis), Iroko (Milicia excelsa, Milicia regia), Bubinga (Guibourtia arnoldiana), Ipe (Tabebuja spp), Wenge (Millettia laurentii) and Dark Red Meranti (Shorea acuminata). Samples were produced by using a belt sander. Laser particle size analysis determines the size of dust particles by using laser analyser Mastersizer 2000 working with SOP measuring procedure. The determination of the percentage share of wood dust mixture is important in terms of safety – formation of explosive atmospheres. Using the laser analysis we have determined that Ipe wood produced the majority of dust particles sized less than 550 μm, which is 99,98 % of total sample volume. Dark Red Meranti wood produced the majority of the particles sized more than 550 μm, which is 10,54 % of its sample volume. The size of the dust particles of these exotic woods is determined for the first time in Slovakia using the method listed upwards. The dust particles size determination caters to check the potential risk of explosion followed up by the assessment of the anti-explosion prevention.