A new study is casting doubt on claims that mercury levels are increasing in fish near the oil sands.
The report from two Environment Canada scientists shows that mercury levels are stable and might actually be going down in lakes near major oil sands projects.
But it also says better monitoring is needed to have a clear picture of what is happening.
The findings directly contradict a research paper from 2009 that said mercury levels had gone up more than 25% since 1975.
Published June 4, 2012
