This study was aimed to assess the effectiveness of canola oil sprinkling, low crude protein diet, high level of cleaning and manure pH manipulation, in reducing ammonia and respirable dust concentrations in swine production rooms.  Among the control measures tested, low protein diet reduced ammonia concentrations while canola oil sprinkling tended to result in lower respirable dust levels. Personal monitoring showed higher level of worker exposure compared to area sampling. Ammonia gas monitors yielded higher readings than the standard (NIOSH) method.