TIMELINE: For 50 Years, Polluters Knew PFAS Chemicals Were Dangerous But Hid Risks From Public

As far back as 1950, studies conducted by 3M showed that the family of toxic fluorinated chemicals now known as PFAS could build up in our blood. By the 1960s, animal studies conducted by 3M and DuPont revealed that PFAS chemicals could pose health risks. But the companies kept the studies secret from their employees and the public for decades. Click the link above for a timeline of internal memos, studies and other company documents detailing the two companies’ history of deception.