Smoke from the explosive forest fires in Minnesota drifted into parts of eastern Canada on the current stretch of days. Environment Canada reported areas in Ontario among the worst globally for air quality on some days . Toronto faced urgent warnings about hazardous air from the distant fires . Extreme drought and howling winds helped wildfires spread at breakneck speed through Minnesota and nearby states. Toxic smoke drifted north, blanketing Canada in a thick veil of contaminants.