In Holland in 2030 the ammonia emission from dairy farms can be 28 percent lower than in 2018, a study of Wageningen University & Research shows. The prediction is based on three measures: all dairy farms have low emission barns with an emission of average 8.6 kilogram ammonia per animal location; more farms pasture their cows and add water thinned liquid manure on fields; a lower number of cattle per hectare. All measures together will cost 1.07 euro per 100 kilogram milk.