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Antarctic ozone levelsSciTechDaily
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87% Informative
In 2024 , the ozone hole over Antarctica reached its annual maximum extent on September 28th, 2024 , with an area of 8.5 million square miles ( 22.4 square million kilometers ) This year ’s peak ozone depletion season, which lasts from September 7 to October 13 , saw the hole rank as the seventh smallest since recovery efforts began in 1992 .
The improvement is due to a combination of continuing declines in harmful chlorofluorocarbon (CFC) chemicals, along with an unexpected infusion of ozone carried by air currents from north of the Antarctic .
Researchers rely on a combination of systems to monitor the ozone layer.
The 2024 concentration reached its lowest value of 109 Dobson units on October 5 .
NOAA scientists release instrumented weather balloons from the South Pole Baseline Atmospheric Observatory to observe ozone concentrations directly overhead.
There’s still a long way to go before atmospheric ozone is back to levels before the advent of widespread CFC pollution.
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