2017 SEASON END OZONE SCORECARD
Tulsa Area Ozone Trends Chart

1 Exceedance Day: September 14th

Last updated 10/31/2017

Monitor Site 2017 Highest 8-Hr Ozone Averages (ppm)*
(1st through 4th highest daily readings)
DESIGN VALUE
3-Year Average

of the 4th highest readings
2014 4th High 2015 4th High 2016 4th High 1st Highest
date
2nd Highest
date
3rd Highest
date
4th Highest
date
2014-2016
3-Yr Avg
2015-2017 
3-Yr Average
West (#144 Mannford) .069
14-Sep
.066
2-Aug
.065
7-Apr
.064
7-Jun

.064 .063
.066 .063 .064
East (#178 Lynn Lane) .068
26-May
.068
7-Jul
.065
3-Aug
.064
13-Sep
.063 .064
.063 .065 .063
Central (#1127 Tulsa) .068
14-Sep
.063
7-Apr
.063
7-May
.062
8-May
.065 .064
.065 .068 .062
North (#226 New Location in Skiatook) .073
14-Sep
.065
7-Apr
.065
8-May
.064
7-May

.064
South (#174 Glenpool) .069
23-Jul
.066
6-Jun
.066
14-Sep
.065
7-Jun
.062 .063
.062 .061 .064

An Ozone Exceedance = .071 ppm or greater
Exceedance days are unhealthy air days and shown in red in the table above.

The EPA Ozone Standard uses the Design Value: Although certainly concerning, exceedance days are not the same thing as 'violating the ozone standard'. The standard uses the 4th highest reading each year and averages it with the 4th highest readings from the two prior years. Each monitor's average is calculated uniquely. This 3-year average is called the Design Value. In the table above, the middle columns with dates show the 2017 1st through 4th highest daily readings for each monitor. The 4th highest column is the one that counts at year end - the one that is averaged with the 4th highest readings from the two previous years. Averaging each monitor's 4th highest readings (over 3-years) results in a Design Value for each monitor and the highest Design Value represents the entire metropolitan area. So regardless of the number of exceedance days or how many monitors an area has, the ozone standard uses the highest Design Value for the area.

A Violation of the EPA Ozone Standard = Design Value .071 or greater.

Our 2017 Design Value is .064 ppm as determined by the CENTRAL (and East) monitor. Using the Central monitor's 4th highest values, this is calculated by averaging 2015's 4th high value of .068, 2016's 4th highest value of .062 and 2017's 4th highest reading of .062 ppm (the standard truncates, not rounding up or down).

Does our 2015-2017 Design Value meet the EPA Ozone Standard? *Yes.

*2017 data is preliminary and subject to change as a result of the ODEQ/EPA verification process

 

Tulsa Area Ozone Alert! Days (2000 - present)

Year May June July August September TOTAL Alert! Days

2017

8th 3rd 13th 3

2016
  20th, 28th   28th 10th   4 

2015
  10th         1

2014
    24th       1

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