Smoke from Canadian wildfires carried another day of poor air quality south of the border to the Midwest, where conditions in parts of Minnesota, Wisconsin and Michigan were rated “very unhealthy” Tuesday.

Meteorological summer in Chicago is kicking off with a mini heatwave, following a chilly and dry end to spring.

The explosives had been deployed earlier in May, and failed to activate, during a joint military exercise conducted by the Coast Guard and U.S. Air Force off the shore of Milwaukee.

Wildfires are burning out of control in central Canada, and the smoke is drifting toward Chicago.

The U.S. Coast Guard is warning the public about potential explosive devices that could wash up on Chicago-area beaches.

As the Trump administration cut billions of dollars in federal funding to scientific research, thousands of scientists in the U.S. lost their jobs or grants — and governments and universities around the world spotted an opportunity.

The Illinois Department of Natural Resources said it is monitoring a bear that’s been spotted hanging out all week in St. Clair County, just east of St. Louis.

Illinois is once again moving forward with a planned barrier designed to keep invasive carp from entering the Great Lakes, having secured funding guarantees from the federal government.

Illinois Attorney General Kwame Raoul has announced a $4.8 million settlement with Trump International Hotel & Tower in Chicago, resolving environmental violations related to the building’s cooling system, which uses water drawn from the Chicago River.

Blaze and Pepper — the piping plover momma and papa who raised three chicks on a Waukegan beach in 2024 — are back on the nest with a full clutch of four eggs.

Chicago’s beaches are opening Friday, marking the unofficial start to summer.

Cook County Forest Preserves is on a mission to restore 30,000 acres of habitat to high-quality condition by the year 2030. There’s just one tiny little problem: a lack of native seed.

Chicago's piping plover pair, Imani and Sea Rocket, are officially expecting.

We asked experts what to do when you see something in the Chicago River that doesn’t belong there.

Chicago is cleaning up Friday after powerful thunderstorms tore through the city Thursday evening, bringing down hundreds of trees, leaving some without power, and even delaying the most highly anticipated concert event of the year.

The National Weather Service is warning of a threat for “significant severe weather” Thursday afternoon into the evening. Beyoncé's Cowboy Carter tour kicks off a three-night stand at Soldier Field Thursday night.