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Concentration(ppb) <br /> N N <br /> O fh O Ch O C.t� <br /> Sep-97 <br /> Nov-97 <br /> Jan-98 <br /> iie Mar-98 <br /> May-98 <br /> Jul-98 <br /> Sep-98 <br /> Nov-98 <br /> ov 98 <br /> Jan-99 <br /> Mar-99 <br /> May-99 <br /> Jul-99 <br /> Sep-99 <br /> Nov-99 <br /> Jan-00 <br /> Mar-00 <br /> May-00 <br /> Jul-00 <br /> Sep-00 m <br /> Nov-00 <br /> ori <br /> Jan-01 0 <br /> Mar-01 <br /> Rte► <br /> May-01 <br /> Jul-01 -� <br /> Sep-01 m <br /> M Nov-01 0 O <br /> Jan-02 " <br /> Mar-02 m <br /> N <br /> May-02 m <br /> Jul-02 I Z <br /> m <br /> Sep-02 m <br /> Nov-02 i <br /> Jan-03 z <br /> m <br /> Mar-03 <br /> i <br /> May-03 <br /> Jul-03 <br /> Sep-03 <br /> Nov-03 <br /> Jan-04 <br /> Mar-04 <br /> May-04 <br /> Jul-04 <br /> Sep-04 <br /> Nov-04 <br /> Jan-05 <br /> Mar-05 <br /> . May-05 <br /> Jul-05 <br /> Sep-05 <br /> Nov-05 <br /> i <br />