Explanation:

• Ozone is most recent measurement, Dobson Units and time in UTC. (If blank then there have been no direct sun measurements since midnight. It is too early or too cloudy.)
• UV Index Recent is most recent measurement, index and time in UTC.
• UV Index Max is highest measured since local midnight last night, index and time in UTC.
• Lat. and Long. are latitude and longitude of the observing station

 
This page is updated every 5 minutes.

 
For a map of the ozone layer over Canada, click here.
Or, for a map of the ozone layer compared to normal, click here.
These maps are updated every hour.

Clicking on a city name will bring up an unformatted, untranslated page showing the data that were used to prepare this page.