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.