CARBON MONOXIDE (ppm)	1980	1981	1982	1983	1984	1985	1986	1987	1988	1989	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999
Peak 8-Hr. Indicator	11.3	12.1	9.5	9.3	9.4	10.6	10.2	10.4	10.2	10.3	10.2	10	8.6	7.8	7.7	7.3	7.3	6.3	6.3	5.6
Max. 1-Hr. Concentration	15	15	15	16	16	17	16	14	17	17	18	14	14	11.4	11	9.9	12.4	9.3	10.2	9.9
Max. 8-Hr. Concentration	10.1	11.3	10.3	12.1	8.5	13	10.4	9.4	10.3	10.5	9.1	7.9	7.9	7.5	7.5	6.3	7.1	5.4	4.8	6
Days Above State 8-Hr. Std.	1	1	1	1	0	5	2	1	5	6	1	0	0	0	0	0	0	0	0	0
Days Above Nat. 8-Hr. Std.	1	1	1	1	0	3	1	0	2	5	0	0	0	0	0	0	0	0	0	0