The Global OzoneObserving System (GO3OS) consists of more than 140 monitoring stations of total ozone, the largest number of which is being located in the middle Northern latitudes, while the operation of these stations is being conducted using the following instruments:

• Dobson spectrophotometer
• Brewer spectrophotometer
• Filter Ozonometer ( M-83, M -124)

In the following table there are available for each station the results of the comparisons with the GOME GDP4.0 level-2 total ozone data.

REGION: Siberia
	ID	Name	Country	Lat	Lon	Type
	115m	SAMARA	Russian Federation	53.25	50.45	M-124
	112m	BOLSHAYA-ELAN	Russian Federation	46.92	142.73	M-124
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