Mayor Rahm Emanuel banned new or expanded refineries that produce the stuff, but the Southeast side is still dealing with what's already there.
Photographer Aaron Rose spent a lifetime hiding in plain sight.
Men who ride bicycles share their stories.
Mike Simons of the Tulsa World is traveling on foot in the parts of his city that most people drive through as fast as they can.
"It's the holy grail for architects."
Tips from an exasperated New York City bike mechanic.
The key is density, and locating schools in the town's core.
Used well, it could serve as a powerful example of a city's ability to mine the collective knowledge of its residents for good.
The automated tolls cut down on air pollution, which in turn improves the health of pregnant women.
And what it can teach us about architecture.
Turns out, we're not good at anticipating the kind of community we'll need as we age.
One family's struggle to obtain evidence in the death of their son raises a number of questions.
Midtown is a hive of construction, with one luxury tower after another replacing older buildings. What's being lost?
The mayor's proposed ban faces an uphill political battle.
"If you're buying, we're selling."
Women cyclists share their stories.
It's looking like Canadian furniture magnate and adventurer Bruno Rodi will step in to save the troubled firm.
A new website is putting the Department under a microscope. They don't come out looking so good.
Very few American cities offer residents the easiest way to grab healthy food fast.