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Concentration(ppb) <br /> _ o <br /> O o g <br /> 10/l/1987+ r' <br /> MW2 <br /> 2/2/1988 <br /> MW2 <br /> 6/24/1988 <br /> MW2 <br /> 1/18/1989 <br /> MW2 <br /> 10/12/1989 <br /> MW2 <br /> 12113/1990 <br /> 1 MW2 <br /> T 3/13/1991 <br /> m MW2 <br /> z <br /> N 6/17/1991 <br /> m <br /> z MW2 <br /> m <br /> 3/16/1992 <br /> MW2 <br /> 0 <br /> 6/2/1992 O <br /> c MW2 n <br /> M <br /> 9/17/1992 <br /> MW2 N K <br /> 12/15/1992 = <br /> � MW2 � <br /> c <br /> N <br /> < v 3/12/1993 <br /> m MW2 <br /> N 6/30/1993 y �? <br /> z MW2 <br /> m 8/31/1993 n�a <br /> MW2 <br /> y� 1 211 6/1 993 <br /> r MW2 <br /> m <br /> z 4/29/1994 <br /> MW2 <br /> 9/27/1994 <br /> MW2 <br /> 7/27/1995 <br /> MW2 <br /> 1 111 611 995 <br /> MW2 <br /> 12/30/1996 <br /> MW2 <br /> 8/13/1997 <br /> MW2 <br /> 8/6/1998 <br /> MW2 <br /> 8/10/1999 <br /> MW2 <br /> 8/10/2000 <br /> MW2 <br />