PONT BILLON (LA VILAINE), paramètre Nitrates
mg(NO3)/L
08/03/22
23.3
13/06/22
11.8
27/09/22
0.9
05/12/22
4.8
13/02/23
30.9
23/05/23
20.1
29/08/23
6.6
09/11/23
7.6