Emergency responders work the scene of semitruck crash in Teutopolis, Ill., on Saturday, Sept. 30, 2023. Federal regulators confirmed Saturday they are reviewing the crash of a semitruck carrying a toxic substance in central Illinois, resulting in “multiple fatalities” and dangerous air conditions that prompted the evacuation of area residents. (NewsNation-WTWO via AP)

A semitruck carrying caustic anhydrous ammonia toppled in Teutopolis, spilling more than half of its 7,500-gallon load, according to the Illinois Environmental Protection Agency.

FILE - A turtle pokes its nose out of the water in the wetlands inside Sugar Hollow Park in Bristol, Va., June 12, 2023. (Emily Ball / Bristol Herald Courier via AP, File)
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The Biden administration weakened regulations protecting millions of acres of wetlands, saying it had no choice after the Supreme Court sharply limited the federal government’s jurisdiction over them. It’s a policy shift that departs from a half-century of federal rules governing the nation’s waterways.

FILE - A black plume rises over East Palestine, Ohio, as a result of a controlled detonation of a portion of the derailed Norfolk Southern trains, Feb. 6, 2023. (Gene J. Puskar / AP Photo, File)

Debate over vinyl chloride has simmered for years, but gained a new urgency after the Feb. 3 derailment of a 50-car Norfolk Southern freight train in East Palestine. Three days later, emergency crews released toxic vinyl chloride from five tank cars and burned it to keep them from exploding.

State Sen. Bill Cunningham, D-Chicago, speaks to members of the Illinois Pollution Control Board at the Joint Committee on Administrative Rules meeting on July 18, 2023. Cunningham is the co-chair of the bipartisan 12-member committee. (Andrew Adams / Capitol News Illinois)
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The change repeals existing language that allowed factories, refineries, power plants and other facilities to exceed their emission limits during shutdowns, startups, and malfunctions.

FILE - The Willis Tower (formerly Sears Tower) is pictured in downtown Chicago, where the air quality has been categorized "unhealthy" by the U.S. Environmental Protection Agency, on June 27, 2023. (AP Photo / Claire Savage, file)

Extensive swaths of the northern United States awoke to unhealthy air quality Monday morning or were experiencing it by midafternoon.

Illinois Environmental Protection Agency building. (Capitol News Illinois file photo)
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At issue is a policy Illinois has had since the 1970s that allows factories, power plants, and other industries with air pollution emission permits to exceed their emission limits during startups, shutdowns, or malfunctions.

A decommissioned generating station in Waukegan is pictured in a file photo. (WTTW News)
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Right now, coal combustion residuals – commonly known as coal ash – aren’t subject to EPA regulation at many offline power plants. 

This file photo shows the former site of General Iron in the Lincoln Park neighborhood on the North Side of Chicago. (WTTW News)
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Chicago Department of Public Health officials determined last year the operation posed an “unacceptable risk” to the health of nearby residents, following Environmental Protection Agency investigations and activism from local residents who said their neighborhood could not withstand the pollution they believe the new Southside Recycling facility will bring.

New York City's skyline, shrouded in smoke on June 7, 2023. (Environmental Protection Agency)

With large swaths of the U.S. shrouded in smoke from Canadian wildfires, now's a good time to review the basics of the Environmental Protection Agency's Air Quality Index.

An aerial view of the Chicago Area Confined Disposal Facility, a 45-acre site on Chicago’s Southeast Side that has been in operation since 1984. Inset: The CDF is outlined in red. (Credit: Army Corps of Engineers)

The Army Corps of Engineers’ plan to build a 25-foot-tall “toxic tower” on Lake Michigan has hit a speed bump.

The BP Whiting refinery in East Chicago, Ind., stands on Sept. 21, 2017. (DroneBase via AP, File)

The 134-year-old refinery, located between Hammond, Indiana, and Chicago, is the biggest in the U.S. Midwest and sixth largest nationally. It processes about 440,000 barrels of crude oil daily, making a variety of liquid fuels and asphalt.

FILE - An American Ethanol label is shown on a NASCAR race car gas tank at Texas Motor Speedway in Fort Worth, Texas, Nov. 1, 2014. (AP Photo / Randy Holt, File)

The EPA framed its decision as a way to reduce gasoline prices at a time of market supply uncertainty because of Russia’s invasion of Ukraine. The agency said its action also encourages U.S. energy independence and supports American agriculture and manufacturing.

An International Electric MV Series truck is seen on display in Austin, Texas, Wednesday, Feb. 22, 2023. (AP Photo / Eric Gay, File)
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 The Biden administration will propose strict new automobile pollution limits this week that would require at least 54% of new vehicles sold in the U.S. to be electric by 2030 and as many as two of every three by 2032, according to industry and environmental officials briefed on the plan.

A lead water service line from 1927 lays on the ground on a residential street after being removed on June 17, 2021, in Denver. (AP Photo / Brittany Peterson, File)

The survey released Tuesday was the first time the agency asked about lead pipes and gave the best count yet of how many are underground. Illinois ranked second in with 1.04 million lead pipes.

(WTTW News)

Coal ash, the byproduct created when plants burn coal for power, contains potentially dangerous materials like arsenic, mercury and cadmium that can endanger nearby water supplies. Since coal-fired power plants use a lot of water to keep their equipment cool, they’re often near bodies of water like Lake Michigan.

Michael Regan, the head of the Environmental Protection Agency, announces the Biden administration is launching a broad strategy to regulate toxic industrial compounds associated with serious health conditions that are used in products ranging from cookware to carpets and firefighting foams during an event at N.C. State University, Oct. 18, 2021, in Raleigh, N.C.  (Travis Long/The News & Observer via AP, File)
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The plan would limit toxic PFAS chemicals to the lowest level that tests can detect. PFAS, or per- and polyfluorinated substances, are a group of compounds that are widespread, dangerous and expensive to remove from water.