I-U.S. I-Ejensi Yokuvikela Imvelo (EPA) njengamanje wenza uphenyo mayelana nokuhlobana phakathi kwe-butadiene nomdlavuza.
Ukwengeza, i-EPA yenze uhlelo olusalungiswa lokulawula ukusakazeka kwe-benzene, ikhonjwe njenge-carcinogen. I-ejensi igcizelela ukuthi idatha enkulu ikhona ekhombisa lokho butadiene, kanye nenqubo yayo yokukhiqiza yerabha yenjoloba, Ukuhlobisa kakhulu impilo yabantu.