OKLAHOMA CARBON MONOXIDE
 Highest 8 Hour Averages Through 12/31/2007
PPM          
Site  2003 2004 2005 2006 2007
  1st          2nd 1st          2nd 1st          2nd 1st          2nd 1st          2nd
Tulsa 2.3          2.2 2.0     1.8 1.5     1.5 1.7     1.7 1.8     1.8
Site 191 2/12        2/13 1/23     1/22 1/25    1/26 12/6    12/7  2/22   12/17
           
Tulsa 3.1         2.4 Site Closed Site Closed Site Closed Site Closed
Site 126 2/12       1/3        
           
OKC 3.4        2.8 2.4     2.1 2.4     2.0 2.1     1.9 2.3     2.1
Site 047 1/1        1/21 6/26   11/20 6/25    1/20 1/3     1/2 2/22     11/18
           
Moore 1.4        1.4 Monitor Removed Monitor Removed Monitor Removed Monitor Removed
Site 049 1/1        1/3        
           
Lawton 2.2       1.8 1.0      1.0 1.0     0.9 Monitor Removed Site Closed
Site 647 1/4       1/8 1/22     4/8 2/4    2/10