Scientists say they have found the cleanest air on earth

In a first-of-its-kind study of the bioaerosol composition of the Southern Ocean, researchers from Colorado State University identified an atmospheric region which remains unchanged by human activity.

Researchers found that the boundary layer air, which feeds the lower clouds over the Southern Ocean, was free from aerosol particles produced by human activity -- including burning fossil fuels, planting certain crops, fertilizer production, and wastewater disposal -- or transported from other countries around the world.

Research scientist and co-author of the study Thomas Hill explained that"the aerosols controlling the properties of SO clouds are strongly linked to ocean biological processes, and that Antarctica appears to be isolated from southward dispersal of microorganisms and nutrient deposition from southern continents," he said in a statement.

Using DNA sequencing, source tracking and wind back trajectories scientist and first author Jun Uetake found that the microbes' origins were from the ocean.

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