Canada wildfires: B.C. braces for intense firefighting week as smoke, poor air quality spreads

Canada's wildfire crisis is entering another volatile week, with fast-moving fires, worsening smoke and new evacuation threats stretching from British Columbia to northwestern Ontario. As nearly 4 million hectares have burned this wildfire season, officials are warning that difficult firefighting conditions are expected to continue, while wildfire smoke is once again degrading air quality across much of Western Canada.British Columbia remains Canada's wildfire hotspot, where fires north of Clinton have merged into a massive complex, prompting a planned evacuation order for 70 Mile House and keeping dozens of other communities under evacuation orders or alerts. In Ontario, crews continue battling the record-breaking Thunder Bay 36 wildfire, while smoke from both Canadian fires and large blazes burning in the U.S. Cascades is reducing visibility and worsening air quality across the West.Canadian wildfires continue to be a political flashpoint with U.S. President Donald Trump renewing his criticism of Canada over wildfire smoke drifting south, sharing a graphic depicting a giant "North America Air Filter Barrier" along the Canada-U.S. border and again floating the idea of imposing tariffs tied to smoke pollution crossing into the United States.Follow Yahoo News Canada's live coverage for the latest on active wildfires, evacuation orders, emergency alerts, smoke forecasts, air quality and firefighting efforts across the country.