VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 28.8.2015 SHARE REPURCHASE 28.8.2015 In the Helsinki Stock Exchange Trade date 28.8.2015 Bourse trade BUY Share VAIAS Amount 2 000 shares Total cost 47 495,00 EUR Average price/ share 23,7475 EUR Highest price/ share 23,78 EUR Lowest price/ share 23,68 EUR Vaisala Corporation now holds a total of 120 883 shares including the shares repurchased on 28.8.2015. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#1948388]