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Concentration(ppb) <br /> _ o . <br /> g o <br /> Q a <br /> 0 0 0 Q 4 <br /> 10/1187 <br /> 2/2188 -- <br /> 6/24/88 -- <br /> 1/18/89 -- <br /> 10112/89 -- <br /> 3/13/91 <br /> /21886/241881/18/8910/12/893/13/91 <br /> 3/16192 -- <br /> 6/2/92 - <br /> 12/15/92 - <br /> 3/12193 <br /> 1161926/2/9212/15/923/12193 <br /> 6/30/93 <br /> 8/31/93 <br /> 12/16/93 -- <br /> 0 <br /> 4/29/94 <br /> 9127194 O 0 <br /> 7/27/95 <br /> 2 O <br /> m 11/16/95 - <br /> zO <br /> C <br /> N 3 N <br /> z d 211/96 <br /> m <br /> I <br /> 5/21/96 -- <br /> 8/28/96 - <br /> 21 <br /> /21/96 8128/96 21 12/30/96 <br /> 2/21/97 <br /> 5/9/97 <br /> 8/14/97 <br /> 11/6197 <br /> 2113198 <br /> 5119/98 <br /> 8/6/98 <br /> 1115198 <br /> 2124199 <br /> 5/11/99 -- <br /> 8/10/99 -- <br /> 11/8/99 -- <br /> 218/00 <br /> /11/998/10/991118/99218/00 <br /> 5/2/00 . <br /> I• <br />