Table 6.

Arizona and Troy, New York, USA soil pollution load indices (PLI) by pXRF and ICP-MS method (mean metal(loid) concentrations were used in calculations). A similar PLI value indicates the reliability of pXRF to closely describe the pollution status.

	Arizona
PLI	XRF		ICP-MS
	Yard	Garden	Yard	Garden
Value	1.59	1.53	1.61	1.52
Contamination Status *	Polluted	Polluted	Polluted	Polluted
	Troy, New York
PLI	XRF		ICP-MS
Value	2.01		2.03
Contamination Status	Polluted		Polluted

^*The pollution index calculation combines all elements and due to this summation, some elements can be responsible for driving the pollution index, such as Zn and Cu. This is apparent in the calculated ${\mathrm{I}}_{\text{geo}}$ values where Zn and Cu have a moderate degree of accumulation in Arizona soil. Similarly, Cu is moderately enriched in Arizona soil as indicated in Table 5.