Purpose. To determine the boundary of coal dust concentration in the mine workings air in terms of using filter respirators at coal mines. Methodology. Protective efficiency of filtering respirators is calculated on the basis of determination of geometric mean value of manufacturing protection coefficient of filter respirator offered by the American National Standards Institute and the National Institute for Occupational Safety and Health. Findings. Dependence of undermask dust concentration on air dustiness within mine workings, respirator protection coefficient, and insulating properties of half-masks has been determined. As a result of modeling the distribution of probability of dust concentration values under the mask, it has been determined that the boundary of dust concentration providing safe use of РПА respirator is 10 MAC. Originality. Protective coefficients of domestic filter respirators under working conditions have been substantiated taking into account aspiration value along obturation line caused by half-mask slipping while operating as well as changes in dust concentration coefficients in the working zone air. Practical value. It has been determined that filter respirators of РПА type can be used safely in terms of up to 100 mg/m<^>3 dust concentration.

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