Earth's air mass is divided into circulation regions. The regions are not equally polluted with CO2 emissions. 

The mid-latitude, Ferrel Cells in this illustration is where anthropogenic CO2 is produced. As the Ferral cells fill with CO2 it rubs up against the Hadley Cells and distribution of higher levels of CO2 enter the Hadley winds. Same is true of the Polar Cells but at a lower rate because the production in the upper latitudes is far less compared to the two other air masses. There is also temperature differences that effect density. The air over the poles is also more shallow than over Hadley Cells and accept less volume of gas mixtures.

The illustration above is accurate in it's depiction of Earth's air mass height.

June 17, 2016

Soon after New Zealand (click here) passed a worrying climate change milestone, scientists have confirmed that atmospheric carbon dioxide levels have now also hit 400 parts per million (PPM) in Antarctica.

The South Pole was the last place on Earth to cross the mark - an amount not seen there for four million years and a grim symbol of the swift pace at which man-made pollution is warming the world.

The pole has shown the same, relentless upward trend in CO2 as the rest of world, but its remote location means it's the last to register the impacts of increasing emissions from fossil fuel consumption, the primary driver of greenhouse gas pollution.

The level was recorded for the first time in New Zealand just a few weeks ago at NIWA's Clean Air Monitoring Station at Baring Head, and in Australia shortly before in Cape Grim, Tasmania....