Vaisala Oyj Stock exchange release December 15, 2010 at 9:45 Lauri Rintanen, Executive Vice President, Vaisala Operations has resigned from the company starting January 1st, 2011. His successor will be announced as soon as the new person has been appointed. Further information: Kjell Forsén, President and CEO, tel. +358 400 757 948 Distribution: NASDAQ OMX Helsinki Main media [HUG#1472608]