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CONCENTRATION {ppb} <br /> CDo <br /> i <br /> 0 0 0 <br /> O j O p O O <br /> a O O O O Q <br /> Jan-01 <br /> Mar-01 <br /> May-01 <br /> Jul-01 <br /> Sep-01 <br /> 0 <br /> Nov-01 0 <br /> Jan-02 > <br /> Mar-02 z <br /> z <br /> May-02 --I <br /> 0 <br /> Jul-02 0 <br /> z <br /> 0 <br /> Sep-02 m <br /> Nov-02 n . <br /> �I3 � <br /> n Jan-03 70 <br /> z --IZ <br /> N m Mar-03 N <br /> m C <br /> z N <br /> m May-03 <br /> 1 � <br /> Jul-03 <br /> m <br /> ou m Sep-03 m <br /> r <br /> Nov-03 r <br /> Jan-04 �2 <br /> i <br /> Mar-04 <br /> May-04 <br /> Jul-04 <br /> Sep-04 <br /> Nov-04 <br /> Jan-05 <br /> Mar-05 <br />