Atmospheric and Climate Science Directorate

Stratospheric Ozone

Stratospheric ozone research is conducted by the Air Quality Research Branch to understand the behaviour of stratospheric ozone and to identify and measure the changes in it as a result of human activities. Stratospheric ozone depletion is a long-term issue. Stratospheric ozone levels have been studied for 40 years and the depletion problem emerged only in the past two decades. Causes of the depletion were identified and legislation was developed to reverse the effect. It is expected, with all other influences remaining constant, that it will take at least another decade before a reversal of the downward trend in ozone will be detected, and several more decades for ozone to gradually return to normal levels. Many of the stratospheric ozone studies have been conducted by installing instrumentation on satellites and the space shuttle.

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