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

Annual regional air quality index statistics for 2007

In 2007, the AQI was calculated for 22 weather regions, since the Montréal Island is divided into 4 subregions.

The percentage of days for which the AQI was deemed “good” or ”acceptable” was above 90% in all the regions covered, a first since the program was implemented. It varied between 91.1% and 98.3%. As in previous years, air quality was deemed “poor*” most often on the Montréal Island, with 9.3% (34 days out of 365, the poorest recorded since 2004).

In 2007, this percentage was 1.9%, or 172 hours out of 8,755 valid hours, a figure that was slightly lower than figures for 2006.

The further away the regions in question are from Montréal, the better the air quality, regardless of direction.

* 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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