Assessment of Some Heavy Metals Pollution and Bioavailability in Roadside Soil of Alexandria-Marsa Matruh Highway, Egypt

Table 1

Classes of , CF, , PLI, and PERI.

	Value	Soil quality	Reference
	≤ 0	Uncontaminated	[18]
	0 < < 1	Uncontaminated to moderately contaminated
	1 < < 2	Moderately contaminated
	2 < < 3	Moderately to strongly contaminated
	3 < < 4	Strongly contaminated
	4 < < 5	Strongly to extremely contaminated
	> 5	Extremely contaminated
CF	CF < 1	Low CF	[19]
	1 ≤ CF < 3	Moderate CF
	3 ≤ CF < 6	Considerable CF
	CF ≥ 6	Very high CF
	< 40	Low risk
	40 ≤ < 80	Moderate risk
	80 ≤ < 160	Considerable risk
	160 ≤ < 320	High risk
	≥ 320	Significantly high risk
PERI	PERI < 150	Low PERI
	150 ≤ PERI < 300	Moderate PERI
	300 ≤ PERI < 600	Considerable PERI
	PERI ≥ 600	Very high PERI
PLI	PLI > 1	Polluted	[20]
	PLI = 1	Baseline level
	PLI < 1	Not polluted