This invention describes a mobile system for reducing emission of a slurry, such as a liquid manure, where said mobile system is mounted on a mobile unit (3) and comprises a slurry tanker (5) in liquid communication with means for adding/injecting an acid into said slurry, where said slurry tanker (5) and/or means for adding/injecting an acid into said slurry is in communication with distributing means (7) for allowing a reduced emission slurry to be placed on the application site (9), where said means for adding/injecting an acid into said slurry comprises an acid tank (11), where said acid tank is arranged as a front tank on said mobile unit (3).