Exceedance Days: April 8
Updated: 7/17/2019; 9:50 a.m.
An Ozone Exceedance = 0.071 ppm or greater
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. This 3-year average is called the Design Value. In the table above, the middle columns with dates show this year's 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. Each monitor's readings and averages are calculated uniquely and whichever Design Value is the highest becomes the area's Ozone Design Value.
A Violation of the ozone standard = Design Value 0.071 ppm or greater.
Our 2019 Design Value is currently 0.067 ppm determined by the NORTH monitor, which is calculated by averaging that monitor's 2017 4th high value of 0.064, its 2018 4th high of 0.073, and the same monitor's 2019 current 4th highest reading of 0.064 (the standard uses no rounding).
Does our 2017-2019 Design Value meet the EPA ozone standard? Yes.
*2019 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|
|2018||9th, 10th, 17th||19th, 20th, 25th||1st, 2nd, 10th||9|
|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|