Union Station air quality

Metra passengers pour into Union Station Thursday, May 2, 2013. A recent court ruling requires the owners of the former main Chicago Post Office to operate track exhaust fans constantly to provide ventilation for the tracks at Union Station.

( Michael Tercha, Chicago Tribune / May 2, 2013 )

Metra passengers pour into Union Station Thursday, May 2, 2013. A recent court ruling requires the owners of the former main Chicago Post Office to operate track exhaust fans constantly to provide ventilation for the tracks at Union Station.

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