In 2020, there was significant Arctic stratospheric ozone depletion due to unusual conditions. Scientists used a model to mimic how chemicals and ozone changed in the Arctic stratosphere that year. They matched their model with real data from various instruments to validate the simulation's accuracy. Despite lower levels of harmful compounds than in 2000, the 2019/2020 winter led to extreme ozone loss. Ozone levels dropped to around 40 ppbv, causing similar reactions to those in the Antarctic region. The depletion in a specific ozone layer in the vortex core was more severe in 2020 compared to previous record years like 2011 and 2016.