Stock exchange release 30.12.2008 at 13.00 Vaisala acquires Aviation Systems Maintenance Inc. In line with its strategy, Vaisala seeks to grow as a service provider. The company's US subsidiary Vaisala Inc. acquires Aviation Systems Maintenance, Inc (ASMI), a Kansas, U.S. based airport service company with over 2.6 million USD net sales in 2008. The acquisition will close on January 1st, 2009, and the value of the deal is 3.2 million USD. ASMI's core expertise is founded in over 25 years of customer relationships relating to the installation and maintenance of instrumentation at airports. The acquisition significantly strengthens Vaisala's position as a maintenance provider in the US airport weather market, complementing the current Vaisala contracts and adding expertise in the maintenance services for other instruments commonly used at airports. About Vaisala Vaisala is a global leader in environmental and industrial measurement. Building on more than 70 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 over 1100 professionals worldwide and is listed on the NASDAQ OMX Nordic. www.vaisala.com Further information: In the U.S: Scott Sternberg, Director, Vaisala Services, tel. 520 806 7300 In Finland: Helena Marjaranta, Director, Communications, tel. +358 40 581 9102 Distribution: NASDAQ OMX Nordic Main media