2010 Progress Report - International Joint Commission
2010 Progress Report - International Joint Commission
2010 Progress Report - International Joint Commission
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Ozone Concentration (ppb)<br />
100<br />
90<br />
80<br />
70<br />
60<br />
50<br />
40<br />
30<br />
Figure 23. Annual Average Fourth-highest Maximum 8-hour Ozone Concentration<br />
for Sites within 500 km of the Canada–U.S. Border, 1995–2008<br />
Commitments<br />
20<br />
10<br />
0<br />
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008<br />
Canada<br />
United States<br />
Source: US EPA and Environment Canada <strong>2010</strong><br />
Figure 24. Average Ozone Season 1-hour NO x<br />
Concentration for Sites<br />
within 500 km of the Canada–U.S. Border, 1995–2008<br />
30<br />
25<br />
NO x<br />
Concentration (ppb)<br />
20<br />
15<br />
10<br />
5<br />
0<br />
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008<br />
Canada<br />
United States<br />
Source: US EPA and Environment Canada <strong>2010</strong><br />
35
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