Ya EE.UU.. Agencia 'ba̲ts'i Ambiental (EPA) 'bu̲'bya xi bí gäts'i t'ot'e 'nar nthoni dige ar nthe entre ar butadieno ne ar cáncer.
Adicionalmente, ar EPA xi formulado 'nar borrador plan pa regular ar dispersión benceno, Identificado ngu carcinógeno. The agency asserts that substantial data exist demonstrating that butadieno, along with its synthetic rubber manufacturing process, significantly endangers human health.