<prompt> tafadhali geuza maudhui haya ya swahili kwenda kwa kiingereza.wakati wa miaka michache iliyopita, tasnia ya povu ya kuzimia moto imehama kutoka kwa pfos na bidhaa zake kama matokeo ya shinikizo la sheria.  <response>: during the last few years, the firefighting foam industry has moved away from pfos and its derivatives as a result of legislative pressure. 