Metra riders

<a class="taxInlineTagLink" id="ORGOV0000006" title="Metra" href="/topic/transportation/public-transportation/metra-ORGOV0000006.topic">Metra</a> riders walk alongside track 4 on Tuesday at Union Station. In the wake of a Tribune investigation, the rail service has said it will install new high-efficiency filters to reduce the amount of airborne soot in its train cars. The filters will not affect how much soot is in the air on station platforms, however.

( José M. Osorio/Chicago Tribune )

Metra riders walk alongside track 4 on Tuesday at Union Station. In the wake of a Tribune investigation, the rail service has said it will install new high-efficiency filters to reduce the amount of airborne soot in its train cars. The filters will not affect how much soot is in the air on station platforms, however.

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