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Figure 1 Ground-level ozone exposure indicator, Canada, 1990 to 2005
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Note: The trend line represents an average rate of change of 0.8% per year. From 1990 to 2005, the
indicator shows a statistically significant increase of 12% (plus or minus 10 percentage points,
resulting in a possible increase ranging from 2% to 22% at a 90% confidence level). Ambient data
collected from 76 monitoring stations.
Sources: National Air Pollution Surveillance (NAPS) Network and the Canadian Air and Precipitation
Monitoring Network (CAPMoN); Statistics Canada Census of Population.
