Vaisala Corporation Stock Exchange Release March 16, 2011 7.00 p.m. Correction to Vesa Pylvänäinen's background information in the announcement on appointments in Vaisala's Management Group released Mar 16, 2011 at 1.30 p.m. The correct paragraph reads: Vesa Pylvänäinen joins Vaisala from Elcoteq, where he has worked for nine years in various leadership positions, currently as Vice President, Business Development for the company's Electronics Manufacturing Services (EMS) division. He has extensive experience in Elcoteq ranging from global operations management and operational excellence to account team management and business control. He also has strong international background having had different management assignments in the US, Hungary and Romania. Further information Helena Marjaranta SVP, Communications Tel. +1 303 585 1763 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#1497494]