Vaisala Oyj

Board/Management Information • May 3, 2010

Disclosure 278406

Vaisala - Changes board/management/auditors

Appointment in Vaisala's Management Group

Vaisala Oyj Stock exchange release May 3, 2010 at 10:00 am Kai Konola, M.Sc. (El. Eng.), has been appointed Executive Vice President of the Weather Critical Operations Business Area and a member of Vaisala's Management Group starting July 1, 2010. Kai Konola joins Vaisala from Nokia Siemens Networks (NSN). He has worked in Nokia and Nokia Siemens Networks for fifteen years in various leadership positions, most recently as Head of System Sales for networks in NSN's Customer Operations. Prior to that position, Kai Konola was leading Network Solutions unit as well as Strategy in NSN and Nokia Networks. Antti Ritvos, currently heading the Weather Critical Operations business in Vaisala will take on new challenges outside Vaisala. He will continue in his current role until the end of June. Further information Kjell Forsén President and CEO Tel. +358 400 757 948 Distribution: NASDAQ OMX Helsinki Main media [HUG#1410968]