OKLAHOMA CARBON MONOXIDE
 Highest 8 Hour Averages as of 12/31/06
PPM          
Site  2002 2003 2004 2005 2006
  1st          2nd 1st          2nd 1st          2nd 1st          2nd 1st          2nd
Tulsa 2.8         2.7 2.3          2.2 2.0     1.8 1.5     1.5 1.7     1.7
Site 191  8/27       8/26 2/12        2/13 1/23     1/22 1/25    1/26 12/6    12/7
           
Tulsa 3.2         2.9 3.1         2.4 Site Closed Site Closed Site Closed
Site 126  2/2        2/17 2/12       1/3      
           
OKC 3.3           2.7 3.4        2.8 2.4     2.1 2.4     2.0 2.1     1.9
Site 047 1/15       12/26 1/1        1/21 6/26   11/20 6/25    1/20 1/03    1/02
           
OKC 2.9           2.4 Site Closed Site Closed Site Closed Site Closed
Site 025  2/1        12/26        
           
Moore  1.9           1.7  1.4        1.4 Monitor Closed Monitor Closed Monitor Closed
Site 049 2/2         2/17 1/1        1/3      
           
Lawton 2.3          2.1 2.2       1.8 1.0      1.0 1.0     0.9 Monitor Closed
Site 647  12/15    12/14 1/4       1/8 1/22     4/8 2/4    2/10