During 2008 the concentrations of volatile dust particles in the form of fractions sized up to 10 sm (PM10) and up to 2.5 sm (PM2.5) were measured in the pig farm building with the nominal capacity of 180 pigs placed in stalls with grids. It followed from the multilinear model analysis that PM2.5 fraction was the most impacted with the conditions under survey both inside and outside the building (determination coefficient r2 = 0.98), the PM10 fraction (r2=0.55) was less affected. The highest correlation achieved inside the building was that between the concentration of the PM10 fraction and the precipitation (r = +0.533), between the PM2.5 fraction and the air pressure (r = -0.470). In terms of immissions, it was between the PM10 fraction and the precipitation (r = +0,538) and the PM2.5 fraction and the relative air humidity (r = +0.456).