What are the primary sources of dioxin pollution to land?

Textual description of figure

• Ash and other solid wastes from industry (includes waste sent to landfill) - 50%
• Ash from domestic heating and backyard burning - 26%
• Domestic solid wastes sent to landfill - 15%
• Sludge from sewage works (industrial and domestic) - 9%

Note: These values are approximate and may vary.