Current Ground-Level Ozone - O3 Data Map

View the latest O3 data. Data is refreshed every 60 minutes. Instructions on how to use the map are below.

O3 ppb (1hr)

82 +
62 - 82
45 - 62
35 - 45
25 - 35
15 - 25
0 - 15
No O3 data

View this map in full screen.

Pollutant Objective

There is no Air Quality Objective for O3 over a one hour average period. However, there is an O3 8-hour average objective.

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 and related information.
  • 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

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