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First known observation of Ozone Depletion
Antarctic explorers recorded observations of unusual veil-type clouds in the polar stratosphere -
Halley Bay Observatory
the British Antarctic Survey set up the Halley Bay Observatory on Antarctica in preparation for the International Geophysical Year (IGY) of 1957. In that year, ozone measurements using a Dobson Spectrophotometer began.These measurements gave the first clues that there was trouble in the ozone layer.