Acidifier application rate impacts on ammonia emissions from US roaster chicken houses

► Ammonia emission rates from four roaster houses were measured over eight flocks. ► Each house received a different acidifier (sodium bisulfate) application rate. ► The control treatment daily ammonia-N emission rate was 100 g per 500-kg live-mass. ► Emission rates were inversely correlated with the acidifier application rate. ► The acidifier is limited in its ability to reduce ammonia emissions.