Wildfire smoke causes poor air quality in major Canadian cities

OTTAWA, June 6 (Xinhua) -- Smoke from wildfires burning in northern Ontario and the Prairies of Canada caused poor air quality and reduced visibility in major cities including Toronto, Ottawa and Montreal on Friday.

Environment Canada issued special air quality statements for these areas on Friday, warning that people most likely to suffer health effects from air pollution should avoid strenuous activities outdoors and seek medical attention if experiencing symptoms.