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Table 6 Grouping of elements in PM 10 according to the ratio of summer to winter seasonal average

From: Deep investigation on inorganic fraction of atmospheric PM in Mediterranean area by neutron and photon activation analysis

Ratio >2 Ratio ~1 Ratio <1
Al, Ba, Ca, Ce, Cs, Eu, Fe, Hf, K, La, Mg, Na, Rb, Sc, Ta, Tb, Th, Ti, U, Zr Ag, As, Br, Cl, Co, Hg, I, Mn, Sb, Se, Tl Cd, Cr, Mo, Ni, Pb, V, Zn
Al, Br, K, Na, Ti, U Ag, Ca, Cd, Ce, Co, Eu, Fe, Hf, La, Mg, Mn, Mo, Ni, Se, Tb, Th, Zr As, Ba, Cl, Cr, Cs, I, Pb, Rb, Sb, Sc, Ta, Tl, V, Zn