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12.54am BST

- Joan E Greve and Maanvi Singh

12.30am BST

Chemical giants DuPont and Daikin knew the dangers of a PFAS compound widely used in food packaging since 2010, but hid them from the public and the Food and Drug Administration (FDA), company studies obtained by the Guardian reveal.

The chemicals, called 6:2 FTOH, are now linked to a range of serious health issues, and Americans are still being exposed to them in greaseproof pizza boxes, carryout containers, fast-food wrappers, and paperboard packaging.

Related: Chemical giants hid dangers of forever chemicals' in food packaging