Thermometers (mercury-in-glass)
Mercury is classified as hazardous waste and is highly toxic to humans and animals. Due to its toxicity mercury should never enter the general waste stream where it can end up in landfill and may contaminate groundwater or convert to methyl mercury, a toxic and volatile gas.
Disposal options
Household quantities (10 items or less) can be dropped off free at the Hazardous Waste Transfer Station at:
Why?
Thermometers contain mercury which is toxic. Dispose of them responsibly.