We can say that toner cartridges can be seen as hazardous waste because the empty cartridges take a lot of time to decompose. It takes almost 1000 years to decompose. So if you throw away your empty cartridges in the dustbin or trash, it won't decompose quickly and can also cause landfill. Unrecycled plastic is very harmful to the environment. It is essential to recycle your empty toner cartridge to save the environment.