By JUDSON JONES, NICHOLAS BOGEL-BURROUGHS, DANI BLUM and SALLY GOLDENBERG A plume of dense smoke from scores of raging wildfires stretched across much of the northeastern United States and southern Canada on Thursday, prompting officials and health experts in some of the region’s most populated cities to urge residents to avoid spending too much time in the polluted air. Air quality readings in Chicago, Cleveland, Detroit, Minneapolis and Toronto surged to levels so dangerous that one public…
