Odour nuisance has become a major problem in the pig industry. Foul-smelling dust plays a major role in the spreading of odour. Gas chromatography equipped with a flame ionization detector has successfully separated the compounds adsorbed on the dust. Initial results show that there are approximately 70-100 volatile compounds adsorbed on the dust. The major compounds are similar for different buildings during different seasonal operations, although there is a difference in the concentration levels. A comparison of the gas chromatograms of Tenax with dust and feed reveals a large amount of volatile fatty acids (VFA) and p-cresol adsorbed to the Tenax, but not dust or feed. Also, indolic compounds were not detected on the Tenax, dust or feed. All compounds will be identified with mass spectrometry in the future.