The EPA likely won’t be able to determine the source of a late October oil spill in the Chicago River because the agency was notified about the spill two days after it occurred, the EPA said Tuesday. 

Environmental advocates say a Southeast Side storage company violated city standards for air pollution earlier this year. But the company disagrees, asserting that the state’s more lenient law applies. 

Two months after becoming the first company approved for fracking in Illinois, Woolsey Operating Company has withdrawn its permit. 

After cutbacks at the EPA and skepticism within the Trump administration about climate change, the city of Chicago has made clear its intention to step up efforts to protect the environment.

A Southeast Side company tipped off regulators to its own violation of city air pollution standards, documents submitted to the city show. 

In an effort to fill a void created by federal and state agencies that have cut back environmental oversight, Chicago plans to expand its environmental enforcement division.

U.S. Sen. Dick Durbin is among a handful of legislators behind a bill that would strengthen legal protections for communities disproportionately impacted by pollution and other environmental threats.

An American eel caught by a 5-year-old angler last week is possibly the first such eel ever recorded in the Chicago River, according to the Illinois Department of Natural Resources.

A new poll on climate and energy reveals surprising attitudes from Americans. We talk with the leader of the University of Chicago study group.

Since 2010, the EPA has cited an East Chicago steelmaking facility six times for violations of the Clean Air Act. Now, a group representing nearby residents intends to sue EPA Administrator Scott Pruitt over the renewal of the company’s operating permit.

Since embarking on a new sustainability initiative, Shedd Aquarium has cut annual water use by more than half, from 60 million gallons in 2012 to 28 million gallons today.

Fifteen new high-resolution security cameras will target those who illegally dump old furniture, tires and other waste across the city.

Sea creatures made from flip-flops, beach toys, water bottles and other plastic garbage that washed ashore are part of a new exhibit illuminating the proliferation of pollution in the world’s waterways.

A public art installation along the Chicago River aims to bring the realities of climate change in Antarctica to Chicago. 

A new analysis of citywide carbon emissions data shows that Chicago is 40 percent of the way to meeting emission reduction targets set under the Paris climate deal. 

Cook County Board President Toni Preckwinkle and about a dozen other elected officials will take part in a fundraiser aimed at boosting efforts to improve the quality of the river’s water.