Commissioner Margot Wallström and 155 other people (among them MEPs) have had their blood checked for the presence of persistent chemicals on 6 November.
The tests were part of an awareness-raising campaign organised by World Wildlife Fund (WWF).
Chemicals such as PCBs (Poly Chlorinated Biphenyls) and PBDEs (Poly Brominated Diphenyl Ethers) build up in the human body over time, can be transfered to developing babies in the womb and are known to have serious health implications (eg malfunctions of the reproductive system).