Original metadata (https://www.donneesquebec.ca) (French, HTML)

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Publisher-reported update

2026-08-26

The City of Montreal's Air Quality Monitoring Network (RSQA) measures air quality in the form of a numerical value called the “Air Quality Index (AQI).” This data set provides access to daily AQI values, updated every hour, approximately 10 minutes after the hour. For example, the 13:00 data is available around 13:10, for all three resources. ***Note: ** the AQI systems do not change the time: they always use Eastern Standard Time (EST) and not Eastern Daylight Time (EDT). So in the example above, around 13:10 EDT, the most recent data available will be from 12:00 EST. * Historical values, updated daily, are available [here] (rsqa-iqa-historical). The [list of stations] (rsqa-liste-des-stations) and [sectors] (rsqa-geographic-sectors) linked to RSQA data is also available.

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