Residents in the Fraser River Basin in British Columbia are all too familiar with the thick brown smog that blankets the valley on summer days. But a few years ago, they started noticing a strange, new white haze hanging in the air. Some days, it was so heavy that it blocked their views of Mount Baker. Nobody knew what it was or where it came from; even scientists at Environment Canada were stymied. That is until a team working on the problem from the Fraser River Action Plan “sniffed out” a solution.