Wildfire smoke will linger and spread this weekend. See which cities are most affected. World Von: Ben Noll · Annie Gowen · Tim Craig · Stella Canino-Quiñones · Cat Zakrzewski 17. Juli 2026 um 23:25 The smoke pouring into the U.S. made Detroit, Chicago and D.C. among the world's most polluted major cities as of early Friday.