Is the odour of sulfur dioxide reliable as a warning property?
Not reliable: odour threshold is about the same magnitude as TLV. How can I work with sulfur dioxide safely? This material is a VERY TOXIC GAS. Before handling, it is very important that engineering controls are operating and that protective equipment requirements are being followed. People working with this chemical should be properly trained regarding its hazards and its safe use. If sulfur dioxide is accidentally released, immediately put on a suitable respirator and leave the area until the severity of the release is determined. In case of leaks or spills, escape-type respiratory protective equipment should be available in the work area. Immediately report leaks, spills or ventilation failures. Be aware of typical signs and symptoms of poisoning and first aid procedures. Any signs of illness should be reported immediately to supervisory personnel. Use in smallest possible amounts in a well-ventilated area, separate from the storage area. If possible, use closed handling systems for
