Roiling wildfire smoke from Canada changing air quality on Cape Cod

• An upper-low air pattern has trapped smoke over much of Massachusetts. • Wildfires across Canada have sent dense smoke into the atmosphere. Fine particles eventually reach New England. Out-of-control wildfires rage in Canada, and Barnstable County’s air quality has seen the impact this week. A statewide air-quality alert is in effect until midnight Wednesday, the second straight day that has happened. Dense smoke is expected to hover across Southern New England into Thursday, according to a tweet from the National Weather Service in Boston. Fine particle levels will likely...