2007 Tulsa Metropolitan Area Ozone Score Card
Highest 8-Hour Ozone Averages (ppm) as of 10-01-07

(As of above date): Total Number of Days Standard was Exceeded: 2 Total Number of Monitor Exceedances: 3

2007 Ozone Alert! Days: Aug. 2, Aug. 3, Aug. 14, Aug. 15, Aug 16

Monitor Site				2007 8-Hr. Ozone Averages (1^st through 4^th highest readings) *4^th Highest at end of each season is the key reading, and is averaged with the prior 2-yrs 4^th highest readings. (2007 + 2006 + 2005 4^th highest readings divided by 3) An Ozone Exceedance= .085 or greater at the monitor				Is Our Current 3-Yr. Average Meeting the Ozone Standard? Yes, if the 3-Yr Avg. (of 4^th Highest readings) is  .084 or lower A Violation of the standard = (3-yr avg of ) .085 or greater		2007 4^th High ‘TRIGGER’ A VIOLATION occurs IF 2007's 4^th highest is this value or higher
				1^st Highest date	2^nd Highest date	3^rd Highest date	*4^th Highest date	2004-2006 Avg. of 4^th Highs	2005 – 2007 3-YR AVG  of 4^th Highs	2007 “Trigger” *4^th Highest Ozone Value
*2004 4^th High	*2005 4^th High	*2006 4^th High
Central (#1127 Tulsa)				0.078 15-Aug	0.074 14 Aug	0.071 16-Aug	0.070 13-Aug	0.077	0.077	0.092
0.068	0.082		0.081
NORTH    (#137 Skiatook)				0.080 3-Aug	0.075 3-Sept	0.073  25-Jul	0.073 2-Aug	0.079	0.080	0.088
0.071	0.083		0.084
South (#174 Glenpool)				0.092 13-Aug	0.072 29-Aug	0.070 15-Aug	0.069 21-Apr	0.073	0.073	0.106
0.071	0.072		0.078
East (#178 Lynn Lane)				0.095 14-Aug	0.094 13-Aug	0.078 15-Aug	0.075 2-Aug	0.079	0.080	0.090
0.073	0.081		0.084
West (#144 Mannford)				0.072 15-Aug	0.072 21-Apr	0.071 2-Aug	0.071 1-Sept	0.077	0.077	0.094
0.071	0.076		0.085
An exceedance of the 8-hr ozone standard is  .085 ppm or greater NOTE: all readings are preliminary and unofficial until ODEQ-EPA QA/AQ Process

Explanation of the Ozone Standard

· The new revised national ozone standard is an eight-hour averaged standard and is calculated by averaging data over a three year time period. This average is taken from the fourth highest eight-hour average at each monitor. A violation occurs when the 3-year average (of the 4th highest value) is greater than .084 ppm. We currently meet the standard, as the current 3-year average at each monitor is less than .085 ppm. The 3-year average (of the 4th highest values) is shown above in green.

· To determine an ozone violation, the following example calculation is used: North (Skiatook) monitor’s 2003 4th highest reading was .083, its 4th highest in 2004 was .071, the 2005 4th highest for that monitor is .083. Thus, .083 + .071 + .083 divided by 3 = .079 ppm, which meets the standard (the standard applies no rounding.)

· A violation of the Ozone Standard means that our entire Metropolitan Statistical Area of seven surrounding counties including Tulsa County would be eligible for the EPA “Dirty Air List” or Non-Attainment.

Tulsa Area Ozone Alert! Days
Year	No. of Days
2007	5
2006	12
2005	13
2004	3
2003	8
2002	8
2001	8
2000	15
1999	17
1998	10

Monitor Locations in the
Tulsa Air Shed

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