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Air Quality Index Statistics

The annual statistical portraits indicate the percentage and number of days and hours during which the Air Quality Index (AQI) is “good”, “acceptable” or “poor”. AQI hourly values correspond to hourly observations, while daily values are taken from the maximum hourly AQI of the day.

Overall Annual Summary

  • By region:
2012 2011 2010 2009 2008 2007 2006 2005 2004
  • By sector:
2012 2011 2010 2009 2008 2007 2006 2005 2004

Detailed Annual Summary (french)

  • Number of hours:
2012 2011 2010 2009 2008 2007 2006 2005 2004
  • Number of days:
2012 2011 2010 2009 2008 2007 2006 2005 2004

Quality Control and Assurance of the data

The MDDEFP’s quality control and assurance processes were followed closely while compiling the data for these summaries. However, since these processes are regularly improved and updated, slight adjustments may have been made to the data hereby presented. Note that the summaries include the island of Montréal, which is divided into four subregions.

Measurement of Fine Particles Matter

Under the Air Quality Monitoring Program, a new generation of fine particulate matter measurement instruments has been deployed throughout the monitoring network. The effects of this upgrade have been apparent since 2008 for the island of Montréal, and since 2009 for other regions. This equipment upgrade is one of the reasons for some of the higher readings recorded as compared to prior years. The increase should not be systematically interpreted as air quality deterioration.

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