Gap Fill - Clean Air - Level 6


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   activity      air      analysis      atmosphere      free      human      pristine      purity      region      research  

Paragraph 1

Scientists have discovered what they believe to be the cleanest on Earth. Researchers from Colorado State University and the Australian Bureau of Meteorology conducted on the of the air above Antarctica. They found a over the Southern Ocean, between the south of Australia and Antarctica, that was "unaffected" by human . The scientists said the area they researched formed the in the lower clouds. The of the air showed that it was totally from "anthropogenic aerosols". These are pollutants or particles derived from activity, or dust from other continents. The scientists called this pollution-free area, "truly ".

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