Ministère de l'Environnement
et de la Lutte contre les changements climatiques

Annual sector air quality index statistics for 2004

In 2004, the AQI was calculated for 15 urban sectors, where air quality varied significantly. For a number of sectors, the percentage of days during which air quality was “poor*” rose above 10% (approximately 36 days a year). For some, this percentage exceeded 30%, such as in the sectors of Saint-Joseph-de-Sorel in Sorel-Tracy (127 days out of 359) and the Montée-du-Sourire sector in Rouyn-Noranda (approximately 100 days out of 332).

Unlike regional statistics, which are based on uniform measurements of fine particles and ozone, statistics for sectors may include measurements of a pollutant that is emitted locally and which 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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