Vaisala Corporation Stock Exchange Release March 16, 2011 1.30 p.m. Vesa Pylvänäinen, M.Sc. (Econ), has been appointed Executive Vice President, Vaisala Operations and a member of Vaisala's Business and Strategic Management Groups. He starts in the new position latest in June 2011. Vesa Pylvänäinen joins Vaisala from Elcoteq, where he has worked for ten years in various leadership positions, currently as Vice President, Business Development and Account Management for the company's Electronics Manufacturing Services (EMS) division. He has extensive experience in Elcoteq ranging from business control and global operations management to operational excellence and business management. He has also strong international background; having been heading operations in the US, Hungary and Romania. Hannu Katajamäki, (M.Sc. Eng, MBA), has been appointed Executive Vice President, Vaisala Services and a member of Vaisala's Business and Strategic Management Groups starting April 1, 2011. Hannu Katajamäki has been employed by Vaisala for 15 years in various managerial positions. Currently he is heading the Airports market segment. Increasing the services share of Vaisala's revenue and introducing new service concepts is a key objective in the company strategy. The Services business continues to be reported by the business areas. Scott Sternberg (M.Sc. Physics), the current head of Vaisala Services will concentrate on his role of President, Vaisala Inc, responsible for driving Vaisala's business and position in the North American markets, which mark over one third of the company's overall revenue. Scott Sternberg will remain a member of Vaisala's Strategic Management Group. He has worked for Vaisala since 2004. Further information Kjell Forsén President and CEO Tel. +358 400 757 948 Distribution OMX Nordic Exchange Helsinki Main media Vaisala is a global leader in environmental and industrial measurement. Building on 75 years of experience, Vaisala contributes to a better quality of life by providing a comprehensive range of innovative observation and measurement products and services for meteorology, weather critical operations and controlled environments. Headquartered in Finland, Vaisala employs approximately 1350 professionals worldwide and is listed on the NASDAQ OMX Helsinki. www.vaisala.com [HUG#1497316]