Officials in western Canada warned of “volatile wildfire activity,” as dozens of blazes burn in dry conditions across the country, triggering evacuation orders in affected regions and air quality alerts in several U.S. states this week. By the numbers: Most of the 139 blazes burning in the first major wildfires since Canada’s record season that finally abated in October were in British Columbia (46) and Alberta (46) as of early Tuesday, per the Canadian Interagency Forest Fire Centre. The CIFFC listed 41 of these fires as “out of control” — among them the Parker Lake fire in northern British Columbia, which has burned over 20,000 acres since it began on Friday and which was on Tuesday nearing the town of Fort Nelson, where evacuation orders have already been issued. The fires were impacting six U.S. states’ air quality into Tuesday: the Dakotas, Nebraska, Iowa, Minnesota and Wisconsin.