*** FINAL DATA ***

2010 8-Hour Ozone (updated through December 31, 2010)

AQS Number	Site Name	1st Max 8-Hour (ppm)	Date 1st Max 8-Hour	2nd Max 8-Hour (ppm)	Date 2nd Max 8-Hour	3rd Max 8-Hour (ppm)	Date 3rd Max 8-Hour	4th Max 8-Hour (ppm)	Date 4th Max 8-Hour	5th Max 8-Hour (ppm)	Date 5th Max 8-Hour
08-001-3001	Welby	0.068	04/13	0.065	06/09	0.064	04/14	0.063	08/25	0.062	05/27
08-005-0002	Highland	0.077	06/28	0.076	07/15	0.076	07/16	0.075	08/15	0.074	04/13
08-005-0006	Aurora East	0.075	05/24	0.074	06/28	0.073	04/13	0.070	03/24	0.070	08/26
08-013-0011	S. Boulder Creek	0.082	06/24	0.073	06/09	0.072	04/13	0.072	06/28	0.071	04/14
08-031-0014	Carriage	0.073	07/01	0.071	06/19	0.071	06/24	0.069	04/13	0.069	05/24
08-031-0025	Denver - Animal Shelter	0.068	04/13	0.067	05/24	0.065	06/28	0.064	08/03	0.063	08/05
08-035-0004	Chatfield State Park	0.081	07/15	0.080	06/07	0.079	04/13	0.079	06/28	0.078	07/16
08-041-0013	Colo. Spgs. - Academy	0.080	04/13	0.074	05/24	0.069	06/28	0.068	07/05	0.067	10/01
08-041-0016	Manitou Springs	0.086	04/13	0.076	05/24	0.073	07/05	0.072	06/28	0.069	05/10
08-045-0012	Rifle – Health	0.069	05/29	0.067	04/15	0.066	04/14	0.066	06/23	0.064	05/09
08-059-0002	Arvada	0.077	06/24	0.077	07/15	0.075	06/09	0.075	06/17	0.075	06/19
08-059-0005	Welch	0.076	06/28	0.074	04/13	0.074	07/15	0.072	07/01	0.072	07/31
08-059-0006	Rocky Flats - N	0.083	06/24	0.080	09/03	0.077	08/26	0.076	06/09	0.075	05/27
08-059-0011	NREL	0.079	07/15	0.078	06/28	0.076	06/19	0.074	07/16	0.074	07/31
08-059-0013	Aspen Park	0.080	04/13	0.076	07/15	0.075	06/28	0.073	07/01	0.072	04/14
08-069-0007	** NPS - Rocky Mtn. NP	0.082	04/14	0.079	06/29	0.078	08/25	0.077	06/23	0.077	06/28
08-069-0011	Ft. Collins - West	0.077	06/24	0.075	04/14	0.075	07/01	0.075	08/03	0.074	06/16
08-069-0012	Rist Canyon	0.074	04/14	0.072	06/16	0.071	04/13	0.071	06/24	0.071	08/13
08-069-1004	Ft. Collins - CSU	0.068	04/13	0.067	06/04	0.066	04/14	0.066	07/01	0.065	06/24
08-077-0020	Palisade - Water	0.070	05/29	0.069	05/11	0.068	05/26	0.068	06/23	0.067	04/15
08-083-0006	Cortez	0.076	05/29	0.067	05/11	0.065	05/26	0.064	05/21	0.064	06/23
08-123-0009	Greeley - Weld Tower	0.078	04/13	0.078	06/24	0.074	04/14	0.073	06/28	0.073	08/03

NOTES: Values above the level of the 8-hour standard (0.075 ppm) are highlighted in yellow.

** Rocky Mtn. NP data through Dec. 31, 2010

The 8-hour ozone standard is written such that attainment is met if the 3-year average of the 4^th maximum value from each of the 3 years is less than or equal to 0.075 ppm. Thus, by looking at the 4^th maximum values from the previous 2 years, it is possible to see what the highest 4^th maximum level for the current year could be and still remain in attainment of the standard. This table provides information on the 4^th maximum values for 2008, 2009, and 2010, the current 3-year average, and the maximum possible level for 2011 in order to remain in attainment of the ozone standard.
3-Year Average 4^th Maximum Ozone Values
Site Name	AQS #	2008 4^th Maximum 8-Hour Average Value (ppm)	2009 4^th Maximum 8-Hour Average Value (ppm)	2010 (thru 12/31) 4^th Maximum 8-Hour Average Value (ppm)	2008 - 2010 3-Year Average 4^th Maximum Value (ppm)	2011 Highest Allowable 4^th Maximum 8-Hour Average Value (ppm)
Welby	08-001-3001	0.076	0.072	0.063	0.070	0.092
Highland	08-005-0002	---	0.069	0.075	---	0.083
Aurora East	08-005-0006	---	0.066	0.070	---	0.091
S. Boulder Creek	08-013-0011	0.076	0.073	0.072	0.073	0.082
Carriage	08-031-0014	0.072	0.063	0.069	0.068	0.095
Denver - Animal Shelter	08-031-0025	0.070	0.062	0.064	0.065	0.101
Chatfield State Park	08-035-0004	0.080	0.071	0.079	0.076	0.077
USAF Academy	08-041-0013	0.070	0.060	0.068	0.066	0.099
Manitou Springs	08-041-0016	0.072	0.064	0.072	0.069	0.091
Rifle - Health	08-045-0012	0.066	0.062	0.066	0.064	0.099
Arvada	08-059-0002	0.074	0.070	0.075	0.073	0.082
Welch	08-059-0005	0.073	0.070	0.072	0.071	0.085
Rocky Flats North	08-059-0006	0.079	0.079	0.076	0.078	0.072
NREL	08-059-0011	0.076	0.068	0.074	0.072	0.085
Aspen Park	08-059-0013	---	0.067	0.073	---	0.087
NPS - Rocky Mtn. Nat’l Park	08-069-0007	0.076	0.068	0.077	0.073	0.082
Fort Collins - West	08-069-0011	0.076	0.073	0.075	0.074	0.079
Rist Canyon	08-069-0012	---	0.069	0.071	---	0.087
Fort Collins - CSU	08-069-1004	0.066	0.063	0.066	0.065	0.098
Palisade - Water	08-077-0020	0.070	0.064	0.068	0.067	0.095
Cortez	08-083-0006	0.064	0.064	0.064	0.064	0.099
Greeley - Weld Tower	08-123-0009	0.073	0.067	0.073	0.071	0.087
NOTE: An area is considered to be in attainment of the National Ambient Air Quality Standard when the 3-year average of the annual 4th highest daily maximum 8-hour ozone concentration at a site is less than or equal to 0.075 ppm.

NOTES: Values above the level of the 3-year average 4^th-maximum 8-hour standard are highlighted in red.