Suitable precautions must be taken if there is a potential for a hazardous atmosphere, such as the presence of gases, explains Tony Pickett, global product manager at PPE manufacturer Scott Safety.

In late 2004 three employees working on a Norfolk-based waste management site were found asphyxiated after entering a farm slurry tank. The inquest revealed they were overcome by carbon dioxide. This, compounded by a lack of oxygen, resulted in the workers drowning in less than one metre of liquid.

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