Hauv 2017, cov kws tshawb nrhiav Ulf Bengtsson thiab Lars Hylander tau muaj ib tsab xov xwm luam tawm txog siab amalgam tooj liab thiab nce mercury vapor emission. Cov lus nkag no los ntawm Atlas Kev Tshawb Fawb qhia txog cov kev tshawb fawb thiab nws cuam tshuam.
Nyem qhov no mus nyeem ntxiv txog cov kev tshawb fawb.
