The notoriously polluted Chicago River is about to get cleaner with disinfection technology at a Skokie water treatment facility.
Not that long ago, air pollution from burning coal made the Windy City more like the Smoggy City. Geoffrey Baer tells us how Chicago cleaned up its act.
 

Sign up for the WTTW News newsletter

Thanks to our sponsors:

View all sponsors

Thanks to our sponsors:

View all sponsors

Thanks to our sponsors:

View all sponsors