Vaisala - Changes in company's own shares

SHARE REPURCHASE 29.5.2012

Vaisala Corporation        ANNOUNCEMENT       29.5.2012
SHARE REPURCHASE  29.5.2012                            
In the Helsinki Stock Exchange                         
Trade date                        29.5.2012            
Bourse trade               Buy                         
Share                      VAIAS                       
Amount                                2 605  Shares    
Total cost                        39 197,00  EUR       
Average price/ share                15,0468  EUR       
Highest price/ share                  15,11  EUR       
Lowest price/ share                   15,00  EUR       
Vaisala Corporation now holds a total of 151.134 shares
including the shares repurchased on 29.5.2012.         
On behalf of Vaisala Corporation                       
Nordea Bank Finland Plc                                
Petri Simberg              Julius Summanen