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Tropospheric NO₂ vertical and slant columns from the new satellite instrument SCIAMACHY on ENVISAT are validated by measurements of the <B>A</B>irborne <B>M</B>ulti <B>AX</B>is <B>DOAS</B> (AMAXDOAS) instrument on board the DLR&nbsp;Falcon. The results presented here were obtained in February 2003 on a flight over the Alps, the Po-Valley and the Mediterranean. The tropospheric vertical column measured by AMAXDOAS varied between 16.2 and 35.2*10¹⁵molec/cm² over the Po-Valley where SCIAMACHY data resulted in 19.9 to 37*10¹⁵molec/cm². Over less polluted areas a similarly good agreement was found. The linear correlation between the two datasets results in a slope of 0.93. The slight differences observed can be attributed to the different spatial resolution and the temporal mismatch between the measurements over the Po-Valley.