The lawsuit filed Wednesday by Illinois Attorney General Lisa Madigan and Lake County State’s Attorney Michael Nerheim alleges that Baxter violated a federal permit several times over a five-month span by releasing contaminated water that exceeded pollution limits. 

Children on Chicago’s Southeast Side have higher levels of manganese in their toenails than children in other parts of the city, according to preliminary results of a study aiming to measure the impact of toxic metals on children’s health. 

Surfer environmentalists and the University of Chicago intend to sue U.S. Steel over toxic Lake Michigan spills after it twice released more than the allowable quantity of a cancer-causing chemical into the waters this year.

Organizers from several Chicago environmental groups are demanding more action from the city to combat air pollution in industrialized neighborhoods as Mayor Rahm Emanuel prepares to host a high-profile summit on climate change.

Records related to an April spill of a toxic metal into a Lake Michigan tributary have not been given to Chicago. The city is now threatening to sue U.S. Steel.

China’s most prominent environmental activist talks about the country’s pollution crisis.

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Two months after becoming the first company approved for fracking in Illinois, Woolsey Operating Company has withdrawn its permit. 

Officials responding to last week’s oil spill in the South Branch of the Chicago River have recovered dead wildlife from the water, including 43 fish and four turtles. The source of the spill is still unknown, according to the EPA. 

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.

The EPA says the source of an Oct. 26 oil spill remains unknown, but cleanup efforts continue this week along the 1.5-mile stretch of the south fork of the South Branch of the Chicago River.

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.

Researchers analyzed 1,000 birds collected over the last 135 years by the Field Museum and other institutions to track the amount of soot in the air of Rust Belt cities.