Vaisala Oyj Stock Exchange Announcement 29.06.2010 at 12.00 1(1) Vaisala Oyj's 3000 unlisted shares (series K) have been converted into listed shares (series A). The conversion has been registered in the Finnish Trade Register June 29, 2010. Listing of the new series A shares has been applied for as of June 30, 2010. Further information: Jouni Lintunen, CFO Tel. +358 9 8949 2215 or +358 40 5790181 Vaisala Oyj Distribution: Helsinki Exchanges [HUG#1427994]