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Scientists have observed the anomaly in ozone concentrations in the past, theorizing that the ozone had descended from a higher layer of the atmosphere called the stratosphere, where the air is dry and ozone acts as a protective layer, since it blocks harmful ultraviolet radiation from reaching Earth's surface. But researchers studying the air over Guam found something surprising. The scientific instruments aboard the two research aircraft captured a more comprehensive picture of the chemicals traveling with the ozone-chemicals such as hydrogen cyanide and acetonitrile, which originate in fires. [Source: NASA Climate Change News]
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