… classes from I (no anthropogenic pollution) until IV (excessively polluted). The target is class II (or better). The monitoring sites within the LAWA network of … (class I). In 2016, the annual average of 37 % of the measuring sites is below the target (class II) of total phosphorus, the annual average of 57 % of the measuring … pollution (class I). The annual average of 86 % of the measuring sites is below the target (class II) of ammonia nitrogen, 12 % of the measuring sites rank in class …