Daily sprinkling of small amounts fo soybean oil inside a pig nursery facility reduced odour, H2S and total dust levels of the air inside the barn and in the emission or exhaust ventilation air. Oil sprinkling, as outlined in the MWPS AED-42 publication (40 ml/square meter for the first 2 days, 20 mlk/ square meter for days 3 and 4 and 5 ml/square meter for the remaining time the pigs were in the room. Once every 2 weeks a surge amount of 20 ml/square meter would be added) ,was not effective in reducing ammonia concentrations or respirable dust levels inside the treatment barn when compared to a similar control barn.