2 Exceedance Days: August 7th; October 15th
Through December 31, 2015
Exceedances are unique unhealthy air days, yet Exceedances are not the same as ‘Violating the Ozone Standard’.
The EPA National Ambient Air Quality Standard (NAAQS) for ozone is determined by the monitor with the highest ‘Design Value’. This ozone ‘Design Value’, uses ozone data (level, reading, value…NOT the number of unhealthy exceedance days). Specifically, the Design Value is calculated from the 4th highest value for the year – averaged over a ‘rolling’ 3-year average. In the table above, the middle columns – the ones with dates – show this year’s 1st through 4th highest daily readings per 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 to determine each monitor’s Design Value.
A Violation of the 2008 ozone standard occurs when the 3-year average (which is the Design Value) is .076 ppm or greater. A Violation of the new 2015 ozone standard occurs when the Design Value is .071 or greater.
The last column in the table above indicates our Design Value is .068 ppm. This comes from the Central monitor averaging 2013’s 4th high value (.072), 2014’s 4th highest value (.065) and our current 2015 4th highest reading of .068 ppm (each monitor is averaged uniquely and the standard uses no rounding).
Does our 2013-2015 Design Value meet the EPA ozone standard? Yes!
Our Design Value is .068 ppm *
*2015 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|
|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|