Trump blames Canada for wildfire smoke, says he’ll add cost to tariffs

US President Donald Trump on Friday blamed Canada for wildfire smoke spreading across the United States and said he would add the “incalculable cost” ‌of dealing with the pollution to existing tariffs on Canadian goods. Heavy smoke from hundreds of Canadian fires enveloped a swathe of the US from the Midwest to the Northeast on Thursday and Friday, prompting warnings to residents to stay indoors. Detroit on Friday remained the most polluted city in the world, according to tracker IQAir....