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Annual sector air quality index statistics for 2009


Air quality varies significantly across the 17 urban sectors for which the AQI was calculated. In 2009, the percentages of days where the air quality was “poor” varied between 1.6% in both sectors in the Saguenay region and 39.3% in Témiscaming.

Unlike regional statistics, which are based on uniform measurements of fine particles and ozone, sector statistics may include measurements of a pollutant that is emitted locally and is not included in regional statistics. This means that the AQI value for a sector may differ from the index for the overall region.

Local sources of air emissions that affect a sector’s AQI can vary from one location to another.

* Occurs where the concentration of fine particles is above at least 35 µg/m3 (over a three-hour period) or the hourly ozone concentration is above at least 82 ppb at at least one station in the region.

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