Air Quality in Montréal: 2021 Report Card

Last updated June 20, 2022
Reading time: 1 min

Discover highlights from the 2021 environmental report on air quality in Montréal.

The report shows:

  • A reduction in the number of smog days observed. Result: Seven smog days in 2021, a decrease of three days compared to 2020. Info-Smog
  • The positive impact of the curfew on air quality. Result: During curfew hours, fine particles in the air decreased compared to concentrations measured between 2015 and 2020. 
  • An increase in the number of poor air quality days. Result: 27 days in 2021, compared to 21 days in 2020. In spite of this slight increase, poor air quality days in 2021 remained below statistics from recent years.

Regulation of wood-burning appliances

Combustion from wood heating constitutes the second largest source of fine particle emissions in the air. Since regulations on the use of wood-burning appliances were implemented, a decrease in air pollution has been observed.

Data Analysis

Montréal measures the levels of pollutants in the ambient air to determine the air quality index. Data for the five main pollutants are collected continuously at the 11 permanent sampling stations of the air quality monitoring network (AQMN).

Want to know more? Read the full 2021 Environmental Review report.

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