Chemical Smell at Control Center Halts Traffic at Washington and Baltimore Airports

The ground stops, which also affected the airport serving Richmond, Va., were expected to last until at least 8 p.m., according to the F.A.A., which said the smell had affected air traffic controllers.The ground stops, which also affected the airport serving Richmond, Va., were expected to last until at least 8 p.m., according to the F.A.A., which said the smell had affected air traffic controllers.