Current Sulphur Dioxide SO2 - Data Map

View the latest SO2 data. Data is refreshed every 60 minutes. Instructions on how to use the map are below.

SO2 ppb (1hr)

185 +
150 - 185
110 - 150
70 - 110
* Exceeding 1-hr Objective.
50 - 70
30 - 50
0 - 30
No SO2 data

View this map in full screen.

Pollutant Objective

70 ppb

An Air Quality Objective is the provincial acceptable limit for SO2 concentration, averaged over a 1-hour period.

Read more about the province's Air Quality Objectives and Standards.

How to use the map

  • Navigate: Use your mouse to click and drag the map to a desired location
  • Zoom in to view individual stations: Use the + and - buttons on the top left of the map to increase or decrease the magnification size of the map
  • View station data: All circles represent an air monitoring stations. Click on a circle to view that station's data.
  • Reset Map: Use the Home Button to reset the map.


  • PM2.5 = fine particles with a diameter of 2.5 microns (millionths of a metre)
  • PM10 = small particles with a diameter of 10 microns
  • O3 = ozone
  • NO2 = nitrogen dioxide
  • SO2 = sulphur dioxide
  • ppb = parts per billion
  • ppm = parts per million
  • µg/m3 = micrograms per cubic metre
  • N/A = Readings are monitored but are not available at this time.


Data is refreshed every 60 minutes. View our data license agreement and disclaimer.

More Information

If you have a comment or concern about the air quality content on this website please contact us.

There are more ways to find an air monitoring station and it's latest data.

To access the older version of the interactive map, visit the AQHI Readings Application (requires Adobe Flash Plugin).