Satellite image of the maximum extent of the ozone hole (black) over Antarctica (centre) in 2020. Ozone layer thicknesses are colour coded from black (lowest) through blue, green and yellow to red (highest). The ozone hole reached its annual maximum on 2nd October 2020, covering an area of around 25 million square kilometres. The 2020 hole was one of the deepest for years, but was comparable in size to the peaks of 2018 and 2015. The amount of ozone depleting substances have decreased from peak levels in 2000. Image data obtained by the Copernicus Sentinel-5P satellite's Tropomi (Tropospheric Monitoring Instrument).