2021 Ozone Scorecard*

4 Exceedance Days: June 14; June 15; June 17; August 4

Updated through: December 14, 2021

View the Tulsa Area Ozone Trends Chart

Monitor Site 2021 Highest 8-Hr Ozone Averages (ppm)*
(1st through 4th highest daily readings)		 DESIGN VALUE
3-Year Average
of the 4th highest readings
2018 4th High 2019 4th High 2020 4th High 1st Highest
date		 2nd Highest
date		 3rd Highest
date		 4th Highest
date		 2018-2020
3-Yr Avg		 2019-2021 
3-Yr Average
West (#144 Mannford) .078
14-Jun		 .063
26-Sept		 .063
10-Sept		 .063
8-Oct		 .065 .063
.069 .066 .062
East (#178 Lynn Lane) .087
15-Jun		 .073
17-Jun		 .068
1-Sept		 .068
8-Oct		 .065 .064
.070 .067 .059
Central (#1127 Tulsa) .078
14-Jun		 .078
15-Jun		 .069
1-Sept		 .064
27-Jul		 .065 .062
.073 .066 .058
North (#226 Skiatook) .070
14-Jun		 .068
27-Jul		 .066
26-Sept		 .066
30-Apr		 .066 .064
.073 .064 .062
South (#174 Glenpool) .072
4-Aug		 .066
8-Oct		 .064
26-Sept		 .063
3-Aug		 .064 .062
.067 .064 .061

An Ozone Exceedance = 0.071 ppm or greater
Exceedance days are unhealthy air days and shown in red in the above table.

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 current 4th highest reading, averaged with the 4th highest readings from the two prior years. This 3-year average is called the Design Value. Each monitor’s readings and averages are calculated uniquely and the highest is the Ozone Design Value for the Tulsa area.

A Violation of the ozone standard = Design Value 0.071 ppm or greater.

Our 2021 Design Value is currently 0.064 ppm determined by the EAST (also NORTH) monitor. This is calculated by averaging the monitor’s 2019 4th high value of 0.067, 2020 4th high of 0.059, and its 2021 current 4th highest reading of 0.068 (the standard uses no rounding).

Does our 2019-2021 Design Value meet the EPA ozone standard? Yes.

*2021 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

2021

 15th, 16th, 17th 3 (to date)
2020 0
2019 20th 5th 2
2018 9th, 10th, 17th 19th, 20th, 25th 1st, 2nd, 10th 9
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