2002 Almanac (page 370)  Table A-57  North Coast - Trinity County - Air Quality Trends																				

OZONE (ppm)	1981	1982	1983	1984	1985	1986	1987	1988	1989	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000
Peak 1-Hour Indicator	0.094																			
National 1-Hr. Design Value	0.08																			
Nat. 8-Hr. Design Value	0.072																			
Maximum 1-Hr. Concentration	0.09																			
Max. 8-Hr. Concentration	0.086																			
Days Above State Standard	0																			
Days Above Nat. 1-Hr. Std.	0																			
Days Above Nat. 8-Hr. Std.	1																			

PM10 (ug/m3)	1981	1982	1983	1984	1985	1986	1987	1988	1989	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000
Max. 24-Hour Concentration								125							41	72	54	46	100	51
Max. Annual Geometric Mean															15.5	15	15.5	16.1	21.2	16.3
Calc Days Above State 24-Hr Std								42							0	8	6	0	30	3
Calc Days Above Nat 24-Hr Std								0							0	0	0	0	0	0

CARBON MONOXIDE (ppm)	1981	1982	1983	1984	1985	1986	1987	1988	1989	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000
Peak 8-Hr. Indicator							3.4													
Max. 1-Hr. Concentration							4													
Max. 8-Hr. Concentration							3													
Days Above State 8-Hr. Std.							0													
Days Above Nat. 8-Hr. Std.							0													

NITROGEN DIOXIDE (ppm)	1981	1982	1983	1984	1985	1986	1987	1988	1989	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000
Peak 1-Hr. Indicator																				
Max. 1-Hr. Concentration																				
Max. Annual Average																				

SULFUR DIOXIDE (ppm)	1981	1982	1983	1984	1985	1986	1987	1988	1989	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000
Peak 1-Hr. Indicator																				
Max. 24-Hr. Concentration
Max. Annual Average