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Scientists have discovered what they [belief / believe] to be the cleanest air on Earth. Researchers from Colorado State University and the Australian Bureau of Meteorology [conduction / conducted] research on the purity of the air [above / higher] Antarctica. They found a [legion / region] over the Southern Ocean, between the [southern / south] of Australia and Antarctica, that was "unaffected" by human [active / activity] . The scientists said the area they researched formed the atmosphere in the lower clouds. The [analysis / analysts] of the air showed that it was totally [free / freedom] from "anthropogenic aerosols". These are pollutants or particles [drive / derived] from human activity, or [dust / dusty] from other continents. The scientists called this pollution-free area, "truly pristine".

The scientists analysed the [map / structure] of airborne microbes in the lower clouds over the Southern Ocean. They looked [by / at] the DNA of the microbes and tracked [where / when] they came from. Their analysis included monitoring wind [tragedies / trajectories] to detect how far the microbes may have travelled. They found that the atmospheric eco-system was very [many / much] "isolated," self-contained, and free from contaminants from elsewhere in [the / a] world. The source of the microbes was the Southern Ocean, rather than [airborne / born] pollutants from other continents. The researchers [findings / concluded] that the Southern Ocean is [one / once] of very few places on Earth that has been "[minimally / maximum] affected by anthropogenic activities".