The paper summarize results of comparisons between SCIAMACHY level 2 products and ground-based measurements at a number of stations in Russia and NIS, carried out for the period of ENVISAT commissioning phase validation in 2002 (ENVISAT AO-427). Basically, the study presents preliminary validation of SCIAMACHY ozone and NO₂ vertical column data, coming from nadir-mode measurements in July-December 2002, and generated with the processor version 5.01 (SCIAMACHY Validation MasterSet). The comparison involves regular observations of total ozone at about 20 locations over Russia and NIS, and 2 sites of twilight NO₂ vertical column measurements. In addition, CH₄ vertical column data was compared to ground-based observations at 3 sites. The main results are compared to those achieved before with the similar studies on SCIAMACHY data version 3.53.