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Concentration(ppb) N N <br /> o cn o in o cn <br /> 8/20/1997 - <br /> 10120/1997 <br /> 12/20/1997 <br /> 2/20/1998 <br /> 4/20/1998 - <br /> 6120/1998 <br /> 8/20/1908 - <br /> 1012011998 <br /> 12/20/1998 <br /> 2120/1999 <br /> 4/2011999 - <br /> 6/20/1999 - <br /> 8/2011999 - <br /> 10/20/1999 <br /> /20/19996/20/19998/20/199910/20/1998 <br /> 12/20/1999 <br /> 2/20/2000 --1 <br /> 4120/2000 - <br /> 6120/2000 - <br /> 8/20/2000 - <br /> /20/20006/20/20008/20/2000 n <br /> a <br /> 10/20/2000 <br /> 12/20/2000 <br /> 2/20/2001 W C <br /> 4!20/2001 S O <br /> 6/20/2001 <br /> m <br /> 8/20/2001 Z <br /> 10/20/2001 m <br /> Z <br /> 12/20/2001 m <br /> 2/20/2002 z <br /> 4/20/2002 - <br /> zfl; <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 /> 4/2012003 - <br /> 6/20/2003 <br /> /20/20034/20/20036/20/2003 <br /> 8/20/2003 <br /> 10/20/2003 <br /> 12/20/2003 <br /> 2/20/2004 - <br /> 4/2012004 - <br /> 6/20/2004 - <br /> 8/20/2004 <br /> /20/20044/20/20046/20/2004 6/20/2004 <br /> 10/20/2004 <br /> I <br /> t <br />