OKLAHOMA CARBON MONOXIDE
 Highest 8 Hour Averages Through 12/31/2010
PPM          
Site  2006 2007 2008 2009 2010
  1st          2nd 1st          2nd 1st          2nd 1st          2nd 1st          2nd
Tulsa 1.7     1.7 1.8     1.6 1.4     1.4 1.5      1.3 2.2      2
Site 191 12/6     12/7 2/22    12/5 12/6    12/7 7/1     1/22 12/3     12/2
           
Tulsa   2.18     1.80 1.42     1.26 1.23     1.23 1.41     1.37
Site 1127   1/26      1/3 1/27     1/12 11/1     12/11 12/3     1/19
           
OKC 2.1    1.9 2.3     2.1 Monitor Removed Monitor Removed Monitor Removed
Site 047 1/3   1/2 2/22   11/18      
           
OKC     1.1     1.0 1.4     1.1 1.1     0.7
Site 033     12/7     3/1 1/31     1/29 11/14     3/3