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Scientists say they have found the cleanest air on earth - CNN
Jun 02, 2020 1 min, 0 secs

However, professor Sonia Kreidenweis and her team suspected that the air over the Southern Ocean would be least affected by humans and dust from the world's continents.

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.

Air pollution is caused by aerosols, which are solid and liquid particles and gases that are suspended in the air.

Researchers decided to study what was in the air, and where it came from, using bacteria in the air as a diagnostic tool to infer the properties of the lower atmosphere.

Research scientist and co-author of the study Thomas Hill explained that "the aerosols controlling the properties of SO (Southern Ocean) 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.

"Overall, it suggests that the SO is one of very few places on Earth that has been minimally affected by anthropogenic activities," he added.

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