The tests also found high levels of heavy metals in the Sarnia families, a result a Sarnia doctor said is a wake-up call that shouldn't be ignored.

The study by Environmental Defence, formerly known as the Canadian Environmental Defence Fund, tested families from Vancouver, Toronto, Montreal, New Brunswick and Sarnia for a total of 68 chemicals known or suspected to cause health problems.

While Sarnia had some of the highest contamination levels in the latest study, the program director for Environmental Defence said it would be wrong to believe the problem was concentrated there.

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