Tropospheric column ozone levels were studied using data from the Aura-OMI satellite. The researchers found that high ozone levels in the troposphere are often linked to folding events involving stratospheric ozone layers. These folding events were confirmed by ozone sondes. The study also revealed that tropospheric ozone variations near folding events are not necessarily related to stratospheric ozone levels. The data from OMI and the model used in the study showed good agreement in most cases, except in the tropics where OMI may not detect certain ozone patterns. Overall, the research identified short-lived ozone folds in the troposphere, with scales of a few hundred kilometers, as observed by OMI.