Cape Grim Air Archive

Here is Cape Grim, on the northwestern coast of Tasmania, where they collect and test the Earth’s air:

The Cape Grim Baseline Atmospheric Pollution Station (CGBAPS) commenced operation in early 1976, fulfilling an Australian government commitment to participate in the WMO (World Meteorological Organization) recommended network of global background atmospheric stations, focussed on observing the long-term drivers of climate change and ozone depletion, in particular carbon dioxide (CO₂), chlorofluorocarbons (CFCs), surface ozone (O₃) and aerosols. Cape Grim was chosen as a site representative of the mid-latitudes of the Southern Hemisphere and complimented NOAA’s Southern Hemisphere sites at Cape Matatula, American Samoa (tropical Pacific) and at the South Pole.

(source). They also maintain an archive of Earth air, going back to 1976:

More info here. Maybe for my birthday they’d let me breathe 1979 air. ht to Professor McHugh who’s always sending us wonders.