Exceedance Days (to date):
Updated through: 6/04/2020
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 above 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. It is averaged with the 4th highest readings from the two previous years. Each monitor's readings and averages are calculated uniquely and the highest becomes the Ozone Design Value for the area.
A Violation of the ozone standard = Design Value 0.071 ppm or greater.
Our 2020 Design Value is currently 0.064 ppm determined by the CENTRAL (also WEST and EAST) monitor. This is calculated by averaging the monitor's 2018 4th high value of 0.073, 2019 4th high of 0.066, and its 2020 current 4th highest reading of 0.053 (the standard uses no rounding).
Does our 2018-2020 Design Value meet the EPA ozone standard? Yes.
*2020 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|