An independent scientific adviser has resigned from a Health Canada committee on pesticide management over concerns about a lack of transparency and scientific oversight.

Dr. Bruce Lanphear, a health sciences professor at Simon Fraser University, stepped down as the co-chair of the Health Canada scientific advisory committee on pest control products on June 27.

In his three-page resignation letter, he says he has little or no confidence that the committee can help the pesticide branch of Health Canada become more transparent or assure that Canadians are protected from toxic pesticides.

The committee gives Health Canada independent scientific advice on the health and environmental risks of pesticides, and does evaluations for new products and reviews.

In the letter, Lanphear says he struggled to get certain data and answers from Health Canada staff about contentious products and how the department monitors exposure to toxic pesticides.

He says the way Health Canada regulates pesticides is obsolete, and he is calling for a complete overhaul.