Fine fractions of atmospheric particulate samples collected over 3 weeks in July/Aug 1980 in Shenandoah Valley, VA, and previously analyzed by X-ray fluorescence analysis to provide data for many additional elements. Modified factor analysis of the combined data yielded a regional sulfate component containing S, NH/sub 4//sup +/, V, Mn, Zn, Se, As, In, Sb, And Pb. If the component originates mainly from coal combustion, there is modification of the elemental composition pattern during transport from distant mental composition pattern during transport from distant power plants to the receptors, even in the <2.5-..mu..m fraction. The regional sulfate component should be used in receptor-model treatments of areas strongly affected by sulfate from distant sources, as it may account for substantial fractions of several airborne elements, especially Se and Mn. Particulate S/Se mass ratios from this and other work are usually in the vicinity of 3300 in areas not immediately affected by fresh SO/sub 2/ sources, but drop significantly near such sources.