Multielement study of fog water at the Uludag mountain, Northwestern Turkey, is presented. Fourteen elements (Al, As, Br, Cl, Cs, Fe, I, K, Mn, Na, Sc, Sb, V, Zn) are determined by INAA. Sulfate is determined by ion chromatography. Sulfate showed good correlation with non-crustal Mn. Marine particles dominated fog water composition among four major sources. Low to moderate variations of trace element concentration were observed by using three different fog collectors.