Via University of Alberta:

After an exhaustive study of air and water pollution along the
Athabasca River from Fort McMurray to Lake Athabasca, researchers say
pollution levels have increased as a direct result of nearby oilsands
operations. University of Alberta biological sciences professor
David Schindler was part of the team that conducted a long-term air and
water study and found high levels of polycyclic aromatic compounds,…