Vaisala Corporation Stock Exchange Release February 9, 2011 at 2:30 p.m. Vaisala publishes its Q4/2010 results on Friday, February 18 at 9:00 a.m. The stock exchange release will be available on the company website at www.vaisala.com. CEO's presentation will be published at 12:00 noon (GMT +2) on the same day at www.vaisala.com/investors. Briefing Briefing for analysts and media will be arranged in Hotel Kämp, Paavo Nurmi meeting room, Pohjoisesplanadi 29, starting at 12.00 noon. A light lunch will be served. Please register by email toliisa.ahtiluoto@vaisala.com. Audiocast A live webcast of the presentation of Kjell Forsén, President and CEO of Vaisala, will be sent starting at 12:00 am (GMT +2). The webcast will be available atwww.vaisala.com/investors. It will be recorded and published at the same address by 2:00 p.m. (GMT +2) on the same day. More information: Liisa Ahtiluoto, Communications Manager, liisa.ahtiluoto@vaisala.com, tel. +358 40 730 7695 Distribution: NASDAQ OMX Helsinki Oy Finnish News Agency Other key media --------------- 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#1487123]