2006 Ozone Scorecard – Tulsa Air Quality

9 Exceedances Days: June 8, June 30, July 18, July 20, August 4, August 19, August 23, September 15, September 30

Monitor Site					2006 8-Hr. Ozone Averages (1^st through 4^th highest readings) 4^th Highest at end of season is key reading, and is averaged with the 2004 and 2005 4^th highest readings An Ozone Exceedance= .085 or greater				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 = .085 or greater
					1^st Highest date	2^nd Highest date	3^rd Highest date	4^th Highest date	2003-2005 Avg. of 4^th Highs	CURRENT 3-YR AVG 2004 – 2006 Avg. of 4^th Highs
2003 4^th High	2004 4^th High		2005 4^th High

Central (#1127 Tulsa)					0.106 20-Jul	0.086 18-Jul	0.082 30-Jun	0.081 29-Jun	0.076	0.077
0.080		0.068		0.082

NORTH (#137 Skiatook)					0.095 20-Jul	0.094 18-Jul	0.087 30-Jun	0.084 29-Jun	0.079	0.079
0.083		0.071		0.083

South (#174 Glenpool)					0.107 19-Aug	0.093 4-Aug	0.087 30-Sep	0.078 8-Jun	0.076	0.073
0.086		0.071		0.072

East (#178 Lynn Lane)					0.112 20-Jul	0.099 19-Aug	0.091 4-Aug	0.084 19-Jul	0.079	0.079
0.084		0.073		0.081

West (#144 Mannford)					0.085 8-Jun	0.085 19-Aug	0.085 23-Aug	0.085 15-Sep	0.076	0.077
0.081		0.071		0.076
An exceedance of the 8-hr ozone standard is .085 ppm or greater * NOTE: all readings are preliminary and unofficial

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
2006	12
2005	13
2004	3
2003	8
2002	8
2001	8
2000	15
1999	17
1998	10