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

2020 Annual Regional Air Quality Index Statistics

The Air Quality Index (AQI) was calculated in 2020 for 24 weather regions, the Island of Montréal being divided into four sub-regions.

The percentage of days in which the AQI was deemed “good” or “acceptable” varied from 96% in the Île de Montréal - Nord sub-region (350/366) to 100% for the Estrie, Laurentides, Mont-Laurier and Haute-Gatineau regions.

Montréal was where air quality was most often “poor*,” with a proportion of 4% (16/366 days) as measured at the Île-de-Montréal sub-region. The result was an improvement over 2019, where the proportion was 7%.

In overall terms, the respective AQI “good,” “acceptable” and “poor” proportions were 66%, 33% and 1%. Compared to 2019, the “good” proportion of results increased by 3%, with the gain coming from a decrease in the “acceptable” category.

*Occurs when the concentration of at least one of the contaminants used to calculate the AQI exceeds its hourly reference value at one or more of the region’s measuring stations.

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