Large quantities of waste are dumped in waste sites, which fall into several categories, including garbage dumps, landfill, toxic waste sites, radioactive waste sites, etc. Most troublesome are toxic waste sites containing poisonous chemicals and radioactive waste. These are ultimately the most costly and dangerous because of the extremely long half-life of some radioactive waste. There are an estimated 100,000 toxic waste sites in the United States. Many are poorly documented, unsupervised, and unregulated.
Subjects: Public Health and Epidemiology.