Not only is it still there, a recent study found levels at a former US air base at Danang were 300-400 times higher than accepted limits.
These levels were in areas where Agent Orange was mixed before being put on planes to defoliate entire areas. Not only did it destroy the lives of innocent Vietnamese, it must have done the same to the unfortunate US soldiers who had to mix it.
And it’s still destroying lives in Vietname, judging from recent hideous health problems detailed in the article. The US appears to be doing as little as possible to remediate the health disaster it created.