"Buraco" na Troposfera

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Scientists have discovered a hole in the atmosphere that allows ozone-depleting compounds and other chemicals to bypass the atmosphere’s natural “washing machine” layer.

The lowest layer of Earth’s atmosphere, known as the troposphere, is full of hydroxyl (OH) radicals which are known as the detergent of the atmosphere. This is because OH is highly reactive and can break down all sorts of pollutants, chemicals and natural substances emitted by living organisms including humans, plants, animals, fungi, and microbes. The substances become water soluble and are washed out of the troposphere during rainstorms.

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http://www.wired.com/2014/04/oh-hole-washing-machine/