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	18.6	17.2	15.7	13.9	13.6	13.4	13.9	13.9	14.1	13.7	13.9	13.2	11.5	10	10	10.9	9.9	9	8.3	8.5
Max. 1-Hr. Concentration	24	18	18	17	24	18	21	16	19	23	17	19	13	13	15	12	11	9.9	10.3	11.9
Max. 8-Hr. Concentration	15.5	13.6	14.8	14.3	15.7	11	16.3	12.9	16.5	13.4	11.5	11.4	8.3	9.3	8.9	9.1	7.7	7.5	8	7.8
Days Above State 8-Hr. Std.	31	12	9	12	7	7	13	4	5	24	10	3	0	2	0	1	0	0	0	0
Days Above Nat. 8-Hr. Std.	26	10	8	9	6	7	11	4	6	18	9	3	0	0	0	0	0	0	0	0