Ozone Content over the Russian Federation in the Second Quarter of 2025

The review is compiled based on the operation results of the system for total ozone (TO) monitoring in the CIS and Baltic countries. The system functions in operational mode at the Central Aerological Observatory (CAO). It uses data from the national network equipped with M-124 filter ozonometers, which is under the methodological supervision of the Main Geophysical Observatory. The quality of the system functioning is operationally controlled at CAO through comparison with the OMI satellite equipment observations (NASA, USA). Basic TO observation data are generalized for each month of the second quarter of 2025 and for the entire second quarter. Data of routine surface ozone observations in Moscow region are also summarized.