The present invention relates to a method for reducing emissions of one or more gaseous substances from an assembly of at least two pieces of wooden materials, which have been glued together. It also relates to a method for producing a laminated wooden product comprising planing at least one of the sides of an assembly having glue lines exposed, and, treating the one or more planed sides by application of one or more treating substances reactive to one or more gaseous substances emitted from the at least one planed side. Finally, the present invention relates to a laminated wooden product having low emissions.