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Table 4.

The range of the phenol concentration for each pollution level.

The pollution levelThe safe concentration (mg/L)The dangerous concentration (mg/L)The range of the phenol concentration R (mg/L)
Level I 0.04 R ≤ 0 
Level II 0.04 0 < R ≤ 0.01 
Level III 0.04 0.01 < R ≤ 0.02 
Level IV 0.04 R > 0.02 
The pollution levelThe safe concentration (mg/L)The dangerous concentration (mg/L)The range of the phenol concentration R (mg/L)
Level I 0.04 R ≤ 0 
Level II 0.04 0 < R ≤ 0.01 
Level III 0.04 0.01 < R ≤ 0.02 
Level IV 0.04 R > 0.02 
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