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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
Outskirt   
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
Downtown   
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