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As much of Asia wheezes, coughs and sniffles its way through another smog season, one isolated and windswept corner of Australia is serving as the global standard for clean air. With panoramic views of swaying tussock grass and the vast crystalline expanse of the Southern Ocean, Tasmania's beautiful Cape Grim peninsula is an unlikely reference point for the scientific world.The facility's isolated location makes it perfect for collecting what many have dubbed the cleanest air in the world -- what air would be like without choking exhaust fumes or industrial smoke.Even Cape Grim is not immune to rising levels of pollution.Even the cleanest air from the southwest is changing rapidly.Ice cores show that Co2 was around about 275 parts per million for most of the last million years.
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