Nitrite (NO2) standaeds as 50 mg/l as/ psqca

[volunteer]

I have a simple question about the subject standard,

Table ll at Page 4 of thw subject standards ,please see link

http://www.waterpakistan.com/wp-content/uploads/2015/02/0008.jpg

item 14 says Nitrite as (NO2) mg/l Max  50

1. Does PSQCA confirm that it is final and we stand behind this figure ?.

2. what is the meaning of characteristics  for drinking water ?

3. Requirements and

4. Nitrite as (NO2), mg/l Max      50

combining all three , I tend to conclude the drinking water has to have this value 

to be fit for drinking , as per our national standards

Shall appreciate , as a common user , clarification. 

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