*** DRAFT DATA ***

20098-Hour Ozone(updated through September 30, 2009)

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	0.078	08/23	0.077	07/10	0.075	08/11	0.072	08/05	0.071	06/19
08-005-0002	Highland	0.079	08/05	0.077	07/18	0.069	07/06	0.069	07/10	0.069	09/01
08-005-0006	* Aurora East	0.079	09/01	0.068	07/18	0.067	08/12	0.066	07/10	0.066	08/11
08-013-0011	S. Boulder Creek	0.084	08/22	0.079	07/10	0.074	07/15	0.073	06/24	0.071	08/05
08-031-0014	Carriage	0.068	06/28	0.067	07/10	0.066	08/11	0.063	07/18	0.063	08/12
08-031-0025	Denver - Animal Shelter	0.070	07/18	0.067	08/05	0.064	07/15	0.062	08/11	0.060	07/22
08-035-0004	Chatfield State Park	0.085	08/05	0.078	07/10	0.078	07/18	0.071	05/12	0.071	07/22
08-041-0013	Colo. Spgs. - Academy	0.064	08/12	0.063	04/17	0.062	05/17	0.060	05/27	0.060	08/20
08-041-0016	Manitou Springs	0.071	04/17	0.066	08/12	0.065	05/17	0.064	07/16	0.063	04/26
08-045-0012	Rifle – Health	0.064	04/30	0.063	04/16	0.062	03/29	0.062	04/28	0.061	04/29
08-059-0002	Arvada	0.078	07/10	0.074	08/05	0.070	06/28	0.070	08/11	0.070	08/22
08-059-0005	Welch	0.078	07/18	0.074	08/05	0.071	07/10	0.070	07/15	0.068	07/17
08-059-0006	Rocky Flats - N	0.086	08/22	0.085	07/10	0.085	07/15	0.079	08/05	0.077	06/24
08-059-0011	NREL	0.081	07/10	0.076	08/05	0.071	08/22	0.070	07/18	0.070	08/23
08-059-0013	* Aspen Park	0.077	07/10	0.076	08/05	0.067	07/16	0.067	07/17	0.067	07/18
08-069-0007	** NPS - Rocky Mtn. NP	0.075	06/19	0.070	08/07	0.068	05/13	0.068	08/05	0.067	04/26
08-069-0011	Ft. Collins - West	0.082	08/22	0.074	08/11	0.073	05/13	0.073	07/08	0.072	06/19
08-069-0012	* Rist Canyon	0.071	08/21	0.069	06/19	0.069	06/22	0.067	08/13	0.066	08/04
08-069-1004	Ft. Collins - CSU	0.074	08/22	0.069	05/13	0.062	06/25	0.061	07/08	0.060	06/17
08-077-0020	Palisade - Water	0.066	04/30	0.065	05/16	0.064	04/28	0.063	04/29	0.063	08/15
08-083-0006	Cortez	0.066	04/30	0.064	05/18	0.064	06/28	0.063	05/16	0.063	06/19
08-123-0009	Greeley - Weld Tower	0.071	08/11	0.070	08/12	0.070	08/22	0.067	06/19	0.067	06/28

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

* The Aurora East site commenced on 06/09/09, Aspen Park on 05/01/09 and Rist Canyon on 05/28/09.

** Rocky Mtn. NP data thru 8/31/09.

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 2007 and 2008, the current 4^th maximum value for 2009, the current 3-year average, and the maximum possible level for 2009 in order to remain in attainment of the new ozone standard.
3-Year Average 4^th Maximum Ozone Values
Site Name	AQS #	2007 4^thMaximum 8-Hour Average Value (ppm)	2008 4^thMaximum 8-Hour Average Value (ppm)	2009 (thru 8/31) 4^thMaximum 8-Hour Average Value (ppm)	2007 - 2009 3-Year Average 4^thMaximum Value (ppm)	2009 Highest Allowable 4^thMaximum 8-Hour Average Value (ppm)
Welby	08-001-3001	0.070	0.076	0.072	0.072	0.081
Highland	08-005-0002	0.075	---	0.069	---	---
* Aurora East	08-005-0006	---	---	0.066	---	---
S. Boulder Creek	08-013-0011	0.085	0.076	0.073	0.078	0.066
Carriage	08-031-0014	0.076	0.072	0.063	0.070	0.079
Denver - Animal Shelter	08-031-0025	---	0.070	0.062	---	---
Chatfield State Park	08-035-0004	0.082	0.080	0.071	0.077	0.065
USAF Academy	08-041-0013	0.072	0.070	0.060	0.067	0.085
Manitou Springs	08-041-0016	0.072	0.072	0.064	0.069	0.083
Rifle - Health	08-045-0012	---	0.066	0.062	---	---
Arvada	08-059-0002	0.079	0.074	0.070	0.074	0.074
Welch	08-059-0005	0.080	0.073	0.070	0.074	0.074
Rocky Flats North	08-059-0006	0.090	0.079	0.079	0.082	0.058
NREL	08-059-0011	0.085	0.076	0.070	0.077	0.066
* Aspen Park	08-059-0013	---	---	0.067	---	---
NPS - Rocky Mtn. Nat’l Park	08-069-0007	0.078	0.076	0.068 (thru 8/31)	0.074	0.073
Fort Collins - West	08-069-0011	0.085	0.076	0.073	0.078	0.066
* Rist Canyon	08-069-0012	---	---	0.067	---	---
Fort Collins - CSU	08-069-1004	0.069	0.066	0.061	0.065	0.092
Palisade - Water	08-077-0020	---	0.070	0.063	---	---
Cortez	08-083-0006	---	0.064	0.063	---	---
Greeley - Weld Tower	08-123-0009	0.074	0.073	0.067	0.071	0.080
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.

* The Aurora East site commenced on 06/09/09, Aspen Park on 05/01/09 and Rist Canyon on 05/28/09.