Er Value

Potential Ecological Risk

RI Value

Ecological Risk Index

Er < 40

Low

RI < 95

Low

40 ≤ Er <80

Moderate

95 ≤ RI < 190

Moderate

80< Er <160

Considerable

190 ≤ RI < 380

Considerable

160≤ Er < 320

High

380 ≤ RI

Very High

Er ≥ 320

Very high