一个可能的原因是臭氧耗竭或云层高度改变引起紫外线辐射增强。
A likely candidate is rising ultraviolet radiation as a result of either ozone depletion, or a change in the level of cloud cover.
它可以留在大气层的几个星期，并打破下跌到其他有毒化学品，其中一些被怀疑捐款给臭氧层耗竭。
It can remain in the atmosphere for several weeks and break down into other toxic chemicals, some of which are suspected to contribute to the depletion of the ozone layer.
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