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Concentration(ppb) N N <br /> o cn o v, o cn <br /> 8/20/1997 - <br /> 10/20/1997 <br /> 12/20/1997 <br /> 2/20/1998 - <br /> 4120/1998 <br /> 6/20/1998 <br /> 8/20/1998 - <br /> 10/20/1998 <br /> 12/20/1998 <br /> 2/20/1999 - <br /> 4120/1999 <br /> 6/20/1999 <br /> 8/20/1999 <br /> 10/20/1995 <br /> 12/20/1999 <br /> 2/20/2000 <br /> 4/20/2000 <br /> 6/20/2000 - <br /> 0 <br /> 8/20/2000 0 <br /> O <br /> 3 <br /> 10/20/2000 m <br /> 12/20/2000 <br /> 2/20/2001 <br /> 4/20/2001 m O <br /> 6/20/2001 W <br /> 8/20/2001 z <br /> N <br /> 10/20/2001 m <br /> I z <br /> 12/20/2001 111 <br /> 2/20/2002 z <br /> 4/20/2002 P Cr) <br /> z <br /> 6/20/2002 - <br /> 8/20/2002 <br /> /20/2002 8/20/2002 <br /> 10/20/2002 <br /> 12/20/2002 <br /> 2/20/2003 <br /> 4/20/2003 - <br /> 6/20/2003 <br /> 8/20/2003 <br /> 10/20/2003 <br /> 12/20/2003 <br /> 2/20/2004 - <br /> 4120/2004 - <br /> 6120/2004 - <br /> 8/20/2004 - <br /> 10/20/2004 <br /> /20/20044/20/20046/20/20048/20/200410/20/2004 « <br /> 3 <br />