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2014 annual air quality statistics—by region

In 2014, the AQI was calculated for 24 weather regions, the region of Montréal being divided into four subregions.

The percentage of days when the AQI was deemed “good” or “acceptable” ranged from 84% in Montreal (approximately 305 days out of 365) to 100% in the regions of Montmagny, Rivière-du-Loup, Témiscouata, Mont-Laurier and Lac-Saint-Jean.

Air quality was deemed “poor*” most often in Montreal, in a proportion of 16% (60 days out of 365). This result is similar to that of 2013, which showed an improvement with respect to 2012 (19% or 70 days out of 360).

Overall, the AQI was “good”, “acceptable”, or “poor” in the following proportions, respectively: 56%, 42%, and 2%. In comparison with 2013, “good” AQI increased by 3%, whereas the “acceptable” index decreased by 2% and the “poor”, by 1%.

* Air quality is deemed “poor” when at least one station in the region reports a concentration of fine particulate matter greater than 35 µg/m3 (over a three-hour period), or an hourly concentration of ozone greater than 82 ppb.

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