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BENZENE CONCENTRATIONS (ppb) <br /> N m <br /> 0 0 0 0 0 0 <br /> Dec-91 <br /> t <br /> Jun-92 <br /> Dec-92 <br /> i <br /> t <br /> Jun-93 ; <br /> Dec-93 -� <br /> Jun-94 <br /> i <br /> Dec-94 <br /> Jun-95 <br /> Dec-95 <br /> l � <br /> t <br /> Jun-96 <br /> E <br /> Dec-96 E �] <br /> Jun-97 <br /> 'TJ --I <br /> n Dec-97 # - <br /> m <br /> w Jun-98 <br /> v k y C <br /> 0 Dec-98 f° <br /> r { <br /> � n <br /> Jun-99 w <br /> Dec-99 o <br /> Jun-00 r" <br /> Dec-00 <br /> Jun-01 <br /> k <br /> Dec-01 ` <br /> Jun-02 <br /> Dec-02 E <br /> Jun-03 ! <br /> k <br /> Dec-03 <br /> Jun-04 f <br /> Dec-04 <br /> i <br /> I <br /> e1 <br />