Vaisala Oyj Stock Exchange Release 02.08.2010 at 11:30 a.m. Vaisala publishes its Q2/2010 results on Wednesday August 11, 2010 at 09:00 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 +3) 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, Helsinki, starting at 12:00 noon. Please register by email to helena.marjaranta@vaisala.com. Audiocast A live audiocast of the presentation by Kjell Forsén, President and CEO of Vaisala, will start at 12:00 noon (GMT +3). The audiocast will be available atwww.vaisala.com/investors. A recording will be published at the same address at approximately 2:00 p.m. (GMT +3) on the same day. More information: Helena Marjaranta, SVP Communications, tel. +358 40 5819 102 --------------- 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#1435231]