Arlóri ní ẹ̀fúùfù kẹta tó wọ́pọ̀ jùlọ nínu afẹ́fẹ́ayika aye, ní 0.93% (9,300 ppm), èyí sọ di èyí tó rẹpẹtẹ ní ọ̀nà bi 23.8 BÍ TI Ẹ̀fúùfù inú afẹ́fẹ́ayika tto wọ́pọ̀ jùlọ tó tẹ́lẹ̀, yun Dínksì Karbọnú (390 ppm), àti tó pọ̀ rẹpẹtẹ ní ọ̀nà tó tó 500 bí ti ẹ̀fúùfù áire kejì tó wọ́pọ̀, yun Neranunu (18 pp: 