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After three days of dealing with smoky, particulate-filled air, many Philadelphians went outside Sunday to enjoy the sunshine, gentle winds, and relatively clear horizons. But hundreds of miles northwest in Ontario, wildfires continued to burn, posing a life-threatening emergency to some Canadians and leaving much of the United States susceptible to more rounds of smoke. Experts say the ongoing wildfires will threaten air quality in the region, while the longer dry seasons, droughts, and high wi