Experiments were performed in a pig grower-finisher room to determine the effect of canola (rapeseed) oil treatment of feed on several indices of dustiness. The effectiveness of the oil treatment was assessed over 18 weeks by measuring the respirable dust particle counts (RPC), airborne dust inhalable mass concentration (IMC), and dust sedimentation rate (DSR). The dry feed contained 0% and 2% canola oil on alternate weeks. The pen floors were partially slatted during the first 8 weeks and were totally slatted during the last 10 weeks. The mean RPC was 45% higher for the oil treatment compared to the no-oil treatment. The mean IMC was 31% lower for the oil treatment compared to the no-oil treatment. The mean DSR within the room was 7% lower and within the recirculation duct was 9% lower for the oil treatment compared to the no-oil treatment. None of these differences were statistically significant (P>0.1).