Purpose of this Course is for persons who must know the most common harmful gases and vapours. People credited with this unit standard are able to: Explain the ceiling limits and effects of the gases and vapours. Explain the various types of detection and measurement methodologies for the gases and vapours and the detection instruments' operation. Explain the characteristics, sources, and occurrence of the gases and vapours. Explain the action to be taken and the consequences of not taking action if the gases and vapours are encountered. The knowledge and understanding demonstrated within this unit standard contribute to social and economic transformation and the upliftment and economic growth of the mining and minerals sector by demonstrating knowledge of the most common harmful gases and vapours as part of the mining process. This unit standard is intended to promote general knowledge and understanding of persons responsible for making safe a workplace in the mining and minerals sector in order to ensure knowledgeable, competent and informed workers.