营养污染物

I

II

III

IV

V

劣V

TN/(mg/L)

≤0.2

0.2~0.5

0.5~0.1

1.0~1.5

1.5~2.0

≥2.0

TP/(mg/L)

≤0.02

0.02~0.1

0.1~0.2

0.2~0.3

0.3~0.4

≥0.4