Contamination with PFAS – or so-called "eternal" pollutants – is a phenomenon whose extent is not yet known. For industry, they are ideal substances, resistant to water and heat.

They are omnipresent in our daily lives: non-stick pans, food packaging, fire-fighting foams, raincoats and even toilet paper. If left unchecked, nearly 4.5 million tonnes of PFAS will end up in the environment over the next 30 years. A group of journalists from 17 media outlets in 13 countries wanted to find out.