[1/3] Smoke rises above the southeast perimeter of the Paskwa fire (HWF030) as it burns near Fox Lake, Alberta, Canada May 16, 2023. Alberta Wildfire/Handout via REUTERSMay 17 (Reuters) - Smoke blanketed the skies over much of Alberta on Wednesday as firefighters from Canada and the United States battled raging wildfires that have prompted evacuations, disrupted rail service and shuttered energy production in Canada's main oil-producing province. Of estimated May production volumes, about 60% are currently subject to extreme wildfire danger levels, with the remaining 40% subject to very high danger, Oslo-based Rystad said. Wildfire smoke has covered a large part of Western Canada. Air quality in places including Edmonton and Alberta has deteriorated to category 10+, the worst level on Environment Canada's Air Quality Health Index, indicating "very high risk."

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