We carried out in the area Jelšava – Lubeník, polluted by magnesite fallout, sampling of the foliage of the individuals of Austrian pine (Pinus nigra A r n o l d) and blue spruce (Picea pungens E n g e l m.) planted out at different distance from the source of pollution. By means of raster microscope JEOL JSM 840 and X-ray analyser LINK 10000 we studied the particles deposited on the surface of needles (year-class 1995, 1996, 1997) it means dustiness in % (relative number of particles or % of a needle area covered by dust), which ranged from 10 to 30%, according to the distance from the source of pollution. We categorized the particles of solid fallout deposited in the stomata according to their shape and chemical composition. The particles typical for the production of magnesite and ferrous metals (Si, Al, Fe, S) with the particles composed of Mg prevailed. The state of stomata was evaluated according to the presence of respective kinds of epicuticular waxes (ratio of original tubular crystal wax and amorphous shapes forming the crust) and it was given in %. In older year-classes we found 30–50% of relatively functional stomata and 5–10% of stomata were non-functional and remaining 35–60% were functional only partially. In the needles of both evaluated tree species we recorded increased concentration of Fe, S, Mg, Ca, Zn and Mn, which corresponds with resultant values of the analyses of particles deposited on the surface of the foliage in particular sampling years.