[en] The paper presents the most recent data, collected during 1987-1989, on concentrations of ²²²Rn products in the air of all Polish underground non-uranium mines, and data on the exposure of the miners employed there. The exposures of miners were evaluated by using individual etched track dosemeters, worn on helmets of representative groups in every mine. The weighted average annual exposures in coal, metal ore, and chemical raw materials ore mines were 1.07, 0.547 and 0.255 x 10^-3 J.h.m.^-3 (0.315, 0.161 and 0.075 WLM), respectively. Also, the paper presents expected 'frequency' distributions of individual miner exposure in particular mines, as well as the computer simulations of 'relative frequency' distributions of expected miner exposure with the annual limit of exposure (ALE) adopted at the levels of 17, 12, 8.6, 6.9 and 3.4 x 10^-3 J.h.m.^-3 (5.0, 3.5, 2.5, 2 and 1 WLM). (author)