<p>This study examines the trends and variability of total column ozone (TCO) and explores its relationship with key atmospheric parameters. Extratropical regions show higher TCO concentrations in January compared to July, while tropical regions exhibit the opposite seasonal behaviour. Areas with relatively high mean TCO display declining trends, whereas regions with lower TCO levels show increasing trends. Meteorological Parameters during TCO surplus and deficit years over the equatorial Pacific show a pronounced asymmetry between January and July. In January, specific humidity is generally high across most regions during deficit TCO years. Surplus TCO in January is associated with downdrafts over the equatorial Pacific and updrafts over the equatorial Indian Ocean, with a contrasting pattern observed in July. Moreover, surplus TCO over the tropical Pacific is linked to strong vertical wind shear. Results show that ozone surplus years are associated with positive OLR anomalies, reduced cloudiness, suppressed deep convection, lower humidity, enhanced atmospheric stability, anomalous subsidence, and stronger zonal wind shear, conditions that favour ozone accumulation through limited convective dilution and enhanced dynamical transport. In contrast, ozone deficit years are characterized by negative OLR anomalies, increased moisture, active convection, upward motion, and reduced stability, promoting ozone loss via chemical depletion and vertical redistribution. Seasonal analysis reveals that these relationships are strongest during boreal winter and weaker during boreal summer.</p>