Wildfire smoke may be more toxic than usual
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Forecasters warn that hazy, grayish-blue skies could persist for many weeks as fires continue to burn, though most smoke will remain high in the atmosphere.
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Calgary Herald on MSNWildfire live updates: Air quality warning in Calgary | Canada Post halts some deliveries | MEG Energy restores connectionRain overnight in Calgary did little to clear the wildfire smoke affecting the city, leading to an air quality warning early Thursday morning.