Radiation hazard to radon and its daughter products constitutes the greates share in the total radiation dose received by population. It is also an important factor of occupational hazard of big groups of mining industry workers. European organizations such as NEA (OECD) and CEC created a special international intercomparison program for methods and equipment. Poland, represented by Institute of Occupational Medicine in Łódż has been taking part in this program since 1983 in the field of passive dosimeter comparison. The paper presents the results of intercomparisons indicating good agreement of exposure assessment between Polish meters and reference ones. Intercomparisons have been carried out in National Radiological Protection Board, UK - chosen for European region and regarded as reference laboratory.