The review is compiled on the basis of the operation results of the total ozone (TO) monitoring system in the CIS and Baltic countries functioning in operational mode at the Central Aerological Observatory (CAO). The monitoring system uses the data from the national network equipped with M-124 filter ozonometers being under the methodological supervision of the Main Geophysical Observatory. The quality of the system functioning is operationally controlled in CAO by the comparison with the OMI satellite equipment observations (NASA, USA). Basic TO observation data are generalized for each month of the first quarter of 2025 and for the whole quarter. The data of routine surface ozone observations in the Moscow region are also summarized.
IVANOVA et al. (2025) studied this question.