Table 1.

Main elements identifying the estimated sources.

Source	Identifying species (tracers)
Mineral	Al, Mg, Li, Fe, Ca, Ti, Rb
Traffic	EC, Cu, Sb, Sn, Fe
Organic/textile/chalk	OC, Ca, Sr
Secondary sulfate and organics	SO42–, NH4+
Secondary nitrate	NO3–
Road dust	Ca, Fe, Cu, Sb
Metallurgy	Zn, Pb, Cd, Mn, Cu
Sea spray	Na, Cl–
Heavy oil combustion	V, Ni
Abbreviations: Al, aluminum; Ca, calcium; Cd, cadmium; Cl–, chloride ion; Cu, copper; EC, elemental carbon; Fe, iron; Li, lithium; Mg, magnesium; Mn, manganese; Na, sodium; NH4+, ammonium cation; Ni, nickel; NO3–, nitrate; OC, organic carbon; Pb, lead; Rb, rubidium; Sb, antimony; Sn, tin; SO42–, sulfate; Sr, strontium; Ti, titanium; V, vanadium; Zn, zinc.