Vaisala Oyj

Regulatory Filings • May 11, 2010

Disclosure 278671

Vaisala - Company Announcement

Vaisala cuts costs to improve profitability and competitiveness

Vaisala Croporation Stock exchange release May 11, 2010 at 8:35 a.m. Vaisala is going to reduce costs to improve its profitability and strengthen competitiveness in the global environmental measurement markets. Through a thorough review of its entire cost base, the company is looking for a total of approximately EUR 12 million annual savings. At the same time, Vaisala will align its organization to meet the needs of its market segments more effectively. As part of the profitability improvement plan, the company plans to reduce approximately 100 employees and starts the related negotiation processes. Of the planned reductions, approximately 60 will be in Finland, 30 in the US and 10 in the UK. The planned reductions concern the whole company except for the Controlled Environment business area. More information Jouni Lintunen, CFO, tel. +358 40 5790 181 Helena Marjaranta, SVP, Communications, tel. +358 40 581 9102 US contact: Scott Sternberg, EVP Services and President, Vaisala Inc., tel. +1 303 547 7624 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 1400 professionals worldwide and is listed on the NASDAQ OMX Helsinki. www.vaisala.com [HUG#1414523]