Canada: B.C. wildfire smoke gives Calgary its worst air quality in seven years

Calgary Herald: Calgary's air pollution levels soared Friday to heights not seen since 2003 as smoke from B.C.'s forest fires blanketed the city for a second day. The eerie haze continues to hang over much of Western Canada, with a warning that the elderly, small children and those with pre-existing respiratory conditions could be in for a tough weekend. Calgary's air-quality index sank into the very poor category Friday morning, then hovered into the poor and fair range for much of the day as ......

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