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EVOLUTION DES NITRATES DANS LES NAPPES PHREATIQUES<br />

400<br />

NO 3<br />

EN MG/L<br />

350<br />

300<br />

250<br />

200<br />

150<br />

450<br />

400<br />

350<br />

300<br />

250<br />

200<br />

150<br />

100<br />

50<br />

0<br />

1998<br />

1999<br />

2000<br />

2001<br />

2002<br />

2003<br />

2004<br />

LITTORAL OUEST SUD<br />

100<br />

LITTORAL<br />

50<br />

OUEST<br />

0<br />

1998<br />

1999<br />

2000<br />

ANNEE<br />

2001<br />

2002<br />

2003<br />

2004<br />

SUD<br />

OUEST<br />

LITTORAL<br />

SUD<br />

25

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