Perhaps not coincidentally, the answer to that question came from an ex-manager, Gunther Hiel, a manager who left the company in 2008. “At least until 1996, PFOS and PFOA have been emitted through the air,” he said. Top woman Rebecca Teeters then confirmed this. “Among other things, these emissions are partly responsible for environmental pollution in the vicinity of 3M”. And that was remarkable: in September Teeters said he knew nothing about it. But 3M was unable to say how much exactly came through that chimney.