2002 Almanac (page 349)  Table A-36  Lake Tahoe - Placer 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																				
National 1-Hr. Design Value																				
Nat. 8-Hr. Design Value																				
Maximum 1-Hr. Concentration																				
Max. 8-Hr. Concentration																				
Days Above State Standard																				
Days Above Nat. 1-Hr. Std.																				
Days Above Nat. 8-Hr. Std.																				

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															24	50				
Max. Annual Geometric Mean																				
Calc Days Above State 24-Hr Std															0	0				
Calc Days Above Nat 24-Hr Std															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													3.9	3.9	3.9					
Max. 1-Hr. Concentration	11	15		13									9	11.6	9.5					
Max. 8-Hr. Concentration	7.9	8.5		7.3									4.3	4.7	2.9					
Days Above Lake Tahoe 8-Hr. Std.	2	7		2									0	0	0					
Days Above Nat. 8-Hr. Std.	0	0		0									0	0	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

Portions of Placer County lie within the Mountain Counties and Sacramento Valley Air Basins.