2013 END OF SEASON OZONE SCORECARD
Tulsa Area Ozone Trends Chart

6 Exceedance Days: June 13; July 10; July 13; Sept 4; Sept 6; Sept 7

Through 12/31/2013 

Monitor Site 2013 Highest 8-Hr Ozone Averages (ppm)*
(1st through 4th highest readings)
DESIGN VALUE
3-Year Average

of the 4th highest readings
2010 4th High 2011 4th High 2012 4th High 1st Highest
date
2nd Highest
date
3rd Highest
date
4th Highest
date
2010-2012
Avg
2011-2013 
3-Yr Avg
West (#144 Mannford) 0.073
1-Aug
0.071
26-Sept
0.068
14-Mar
0.068
13-Jul
0.078 0.078
0.069 0.083 0.083
East (#178 Lynn Lane)  0.081
10-Jul
 0.070
11-Jul
0.069
14-May
0.068
13-Jul
0.078 0.077
0.071 0.082 0.082
Central (#1127 Tulsa)  0.076
4-Sept
 0.076
7-Sept
0.074
5-Sept
0.072
13-Jul
0.080 0.080
0.070 0.085 0.085
North (#137 Skiatook)  0.080
6-Sept
0.078
7-Sept
0.077
13-Jul
0.071
5-Sept
0.080
0.080
0.073 0.085 0.084
South (#174 Glenpool) 0.081
13-Jun
0.072
11-Jul
0.070
7-Sept
0.069
13-Jul
0.077 0.077
0.069 0.080 0.083
An ozone exceedance = 0.076 ppm or greater
Is our 2011-2013 Design Value meeting the EPA ozone standard? No

An ozone Exceedance occurs any day that the 8-hr average is .076 ppm or greater. It does not necessarily mean a violation of the ozone standard has occurred. The standard uses the ozone monitor with the highest 'Design Value'. The Design Value is the monitor with the highest ozone data (4th highest value), averaged over a rolling 3-year average. Thus, our Design Value is .080 ppm which is the average of 2011's 4th high value + 2012's + 2013's 4th high (no rounding).

*2013 data is preliminary and subject to change as a result of the ODEQ/EPA verification process

Explaining the Ozone Standard Averages

  • EPA's National Ambient Air Quality Standard (NAAQS) for Ozone is 0.075 parts per million (ppm)

  • The Ozone Standard is calculated by averaging data over a three year time period. This average is taken from the fourth highest (8-hr average) at each monitor. A violation occurs when the 3-year average is greater than 0.075 ppm.

  • The monitor with the highest 3-year average defines an area’s ‘Design Value’.

 

Tulsa Area Ozone Alert! Days (2000 - present)

Year May June July August September TOTAL Alert! Days

2013
   13th  12th 22nd  4th
4

2012  18th  25th, 26th, 27th, 28th, 29th  10th, 11th, 12th, 13th, 21st, 22nd, 28th  2nd, 3rd, 6th, 7th, 8th, 10th  4th, 5th 21
2011 3rd, 15th , 24th, 28th  2nd , 6th , 8th, 9th, 15th, 29th 3rd, 4th, 5th, 17th, 20th, 21st, 24th, 25th, 26th, 27th, 28th 1st, 2nd, 3rd, 13th 25
2010  28th     12th, 19th, 23rd , 28th   5
2009   24th, 25th, 26th, 27th, 30th 1st, 7th, 11th, 16th 13th, 25th    11
2008     18th, 28th, 31st 1st, 2nd, 4th, 5th, 26th   8
2007       2nd, 3rd, 14th, 15th, 16th    5
2006  25th 12th, 15th, 29th, 30th 1st, 2nd, 17th, 19th, 20th, 21st 24th   12
2005   21st, 22nd, 24th, 25th, 26th 30th 1st, 2nd, 4th, 10th 3rd, 4th, 5th 13
2004     15th, 21st, 22nd     3
2003     2nd, 3rd, 30th 6th, 7th, 23rd, 26th, 27th   8
2002   24th, 25th 9th, 10th, 25th 6th, 9th, 31st   8
2001   26th 11th, 25th 3rd, 4th, 6th, 7th 14th 8
2000     17th 1st, 2nd, 3rd, 4th, 15th, 16th, 23rd, 24th, 25th, 26th  2nd, 3rd, 4th, 8th 15