To see if additional grazing can be considered as additional management measure to reduce ammonia emissions, a model-based exploration on the effects of grazing on ammonia emission has been carried out. Increase in grazing dairy cattle from 720 hours per cow per year reduced ammonia emissions by 3.3 grams per cow per hour on annual basis. Besides, it did not matter how the total number of hours grazing came. Grazing seemed to have economic advances as well. Furthermore, it has been explored how grazing as measure can be secured.