The fluorine content in some Polish ceramic clays, representing different ages from Carboniferous to Quaternary, was determined using PIGE method. It varies from about 330 ppm up to 1300 ppm in raw material. Firing of clays at 1200 °C causes significant reduction of fluorine content — usually below 100 ppm. The total emission of fluorine related to the Polish brick industry, consuming the highest amounts of clays in comparison to other branches of ceramics, was estimated. It is significant (e.g. 3.19 thousand Mg in 1989, 1.64 thousand Mg in 1990) and comparable with the fluorine emission of such pollutants of the natural environment as: the aluminum metallurgy, chemical (mainly production of phosphate fertilizers), glass and enamel industries.