As Canada continues to battle relentless forest fires, Thunder Bay's blue skies are sometimes turning grey with smoke from fires, both near and far. While the smoky air has created serious health risks for vulnerable groups, it is also putting the region's already at-risk waterways in jeopardy. According to Robert Stewart, an associate professor in the geography department at Lakehead University, the majority of the area's rivers are negatively affected by urbanization and storm water, but must now deal with the side effects of climate change.