Sign up for the Morning Brief email newsletterto get weekday updates from The Weather Channel and our meteorologists. S​ome cities and hospitals in the Northeast saw an uptick in emergency room visits related to asthma and similar issues at the same time that wildfire smoke from Canada choked skylines and air quality plummeted. H​ere's what happened: -More people with visited emergency departments in New York City Hospitals on Wednesday than any other day in the past year. -in the city...