This three year project evaluates the impact of four different canola oil application rates combined with specific diet formulations on odour and gas emissions from grower-finisher swine buildings. This strategy, combining engineering and nutrition expertise, is expected to significantly reduce the potential impact of the pig barn on its surroundings. Over the first year of the project, an experimental setup made of twelve independent chambers housing four finisher pigs was built. Those chambers are provided with uniform heating and ventilation rates, and with various instruments to continuously measure temperature, relative humidity, dust particles and gas concentrations and to collect odour samples. This laboratory setup will be used to measure effects of different treatment combinations. Laboratory measurements will be collected over four trials, lasting three weeks each, and all those results are expected to be available in July 2000. Preliminary results show that the canola oil sprinkling treatment has an important effect on dust level. Over the blank trial, an application rate of 31 ml/m2-day provided a dust reduction exceeding 90%. However, no treatment effect has yet been observed on NH3 and CO2 production rates. Based on the treatment efficiency with the laboratory setup, the most promising combination of oil application rate and diet formulation will be selected for a full-scale experiment at PSCI scheduled from September 2000 until August 2001. The final report will be available in spring 2002.