The disposal of a fire extinguishing depends very much on the agent stored in the extinguisher. The latest dry chemical extinguishers can be disposed of in normal trash bags and their metal cylinders can be recycled. If the chemical is non-toxic or biodegradable, it is easily disposed of at landfills. However, if you have an old extinguisher, make sure you take it to a specialized shop or a collection center. Trained personnel will depressurize the equipment and handle it with special care. Never forget that the inside material of the cans may be really harmful as well as carcinogenic in nature.