Dust is one of the main contaminants in barn air. Dust not only reduces pig performance and contributes to the deterioration of building and barn equipment, but more importantly, affects the health status of people working in confined buildings. Negative ionization constitutes respirable dust levels in swine barn. A negative ionization system was installed and tested at Prairie Swine Centre Inc. The objectives of this study were to examine the effect of ionization on dust removal in a swine house and to evaluate the potential side effects of the electrostatic charge on building and equipment surfaces. Two identical semi-intensive (20 pens, 5 pigs per pen) growing a