Vaisala Corporation Stock Exchange Release November 7, 2011 at 5:30 p.m. To support business needs and to improve efficiency and the utilization of resources, Vaisala is simplifying its global Research and Development footprint. The R&D activities will be centralized in Helsinki, Finland and Boulder, Colorado, USA. Of the current locations, the European R&D activities in Paris, France and Hamburg, Germany and the US R&D activities in Tucson, Arizona; St Louis, Missouri; Minneapolis, Minnesota; and Columbus, Ohio are planned to be discontinued. In addition to Helsinki and Boulder, R&D activities will continue in four other current locations. Going forward, the company will also increase its development and competence focus on system and software development. The planned consolidation will affect approximately 27 people, of which 20 in the US. All affected employees will be offered a possibility to relocate to Helsinki or Boulder. Further information Helena Marjaranta Senior Vice President, Communications Tel. +358 40 581 9102 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 chosen weather-related and industrial markets. Headquartered in Finland, Vaisala employs approximately 1400 professionals worldwide and is listed on the NASDAQ OMX Helsinki stock exchange. www.vaisala.com Distribution OMX Nordic Exchange Helsinki Main media [HUG#1561568]