Abstract
The seasonal variations of a t m ospheric ozone and Sr-90 fallout were compared at various stations in Canada, India, Japan, UK and USA. The results showed that in the ozone variation 17 out of 43 peaks were observed in March and 11 in April, while the troughs were observed mostly in October and November. For Sr-90 fallout most of the maxima appeared in April and May and the minima from August to October. It is pointed out that as rates of out-flow of ozone and radioactive debris from the stratosphere should be proportional, the rapid removal with seasonal variation must be taken into account in studying the ozone budget in the stratosphere.
