Train drivers represented by the Gewerkschaft Deutscher Lokomotivfuehrer, Germany’s largest train driver union, are threatening to strike nationwide. Leaders of GDL, which represents roughly 80 percent of Germany’s train drivers, will likely provide passengers advance notice of any planned action, which could occur any time after Oct. 5.

Pollution emanating from the Iceland volcano is said to have travelled as far as Paris, where at-risk groups are being advised to limit outdoor activity to a minimum.

Flights were grounded at Chicago’s busy O’Hare and Midway airports this morning following a fire at an air traffic control facility. Departures from Chicago generally stopped at 5:35 a.m. CT and the only arrivals were a handful of flights that departed before the incident. As of 8:05 a.m. CT, about …