Measurement point Ventilated air parameters ZWILKOP ZW-10preparation concentration o/oo Dust concentration, mg/m3 Permissible dust concentrations as per the Ordinance  of the Minister of Labour and Social Policy of 29 November 2002 on the maximum allowable concentrations and maximum allowable intensity of agents harmful to health in the workplace (Journal of Laws 02.217.1833 as amended) respirable fraction inhalable fraction respirable fraction inhalable fraction before preparation use after preparation use before preparation use after preparation use EL EL SP1-70 meters from the gallery exit V=5.0 m/s t=20.7°C p=1063 hPa 20 2.32 2.17 3.58 3.34 1 4 SP 2-5 meters from the longwall V=5.0 m/s t=20.7°C p=1063 hPa 20 6.46 6.02 10.20 8.40 Description of denotations contained in Table 2: • V-air flow speed in the gallery • t-air temperature in the gallery • t-air pressure in the gallery • SP1, SP2, SP3, SP4-reference measurement points • EL (exposure limit): average weighted value of concentration which, when having an effect on a worker within an 8-hour working day and for an average weekly working time specified in the Labour Code, for the duration of such worker’s working life, should not have an adverse impact on their health or the health of their future generations • STEL (short-term exposure limit): average value of concentration which should not cause adverse changes in a worker’s health if it is present in the workplace for no more than 20 minutes and not more frequently than 2 times during a work shift, at a time interval of not less than 1 hour.

Table 2: Measured concentrations of respirable and inhalable fraction of dusts present in the mine air at the measurement points in wall Dz-1, gallery Dz-1, seam 341 in Budryk Hard Coal Mine.