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The Trump administration on Friday moved to roll back Biden-era limits on emissions of ethylene oxide, a cancer-causing chemical often used in the sterilization of medical devices.

The Environmental Protection Agency said repealing the rules, which fall under the National Emission Standards for Hazardous Air Pollutants, would “safeguard the supply of essential medical equipment” — saving approximately $630 million for companies over 20 years. California is home to about a dozen such facilities.

The government said the emissions are part and parcel of protecting people from “lethal or significantly debilitating infections that would result without properly sterilized medical equipment.”

“The Trump EPA is committed to ensuring life-saving medical devices remain available for the critical care of America’s children, elderly, and all patients without unnecessary exposure to communities,” EPA Administrator Lee Zeldin said in a statement.

An estimated 50% of sterile medical devices in the U.S. are treated with ethylene oxide, or EtO, particularly those that can’t be cleaned using steam or radiation. The colorless gas is also used to make chemicals found in products such as antifreeze, detergents, plastics and adhesives.

But EtO poses health risks. Short-term exposure by inhalation can cause headaches, dizziness, nausea, fatigue respiratory irritation and other adverse health effects, according to the federal Agency for Toxic Substances and Disease Registry.

Longer-term exposure increases the risk of cancers of the white blood cells, such as non-Hodgkin’s lymphoma, as well as breast cancer. A now-deleted page from the EPA’s website stated, “EtO is a human carcinogen. It causes cancer in humans.”

Friday’s proposal specifically targets updated rules for EtO emissions that were passed by the Biden administration in 2024 following pressure from environmental justice groups, particularly those in Louisiana’s heavily industrialized “Cancer Alley.” The change sought to reduce the amount of EtO released from commercial sterilizers by 90% and lessen the hazards for nearby communities.

The tighter rules were in part based on EPA’s own scientific study that found it to be 60 times more carcinogenic than previously thought, which the agency now says should be reassessed.

If finalized, the plan would give facilities the choice between installing continuous real-time monitoring systems for EtO emissions or complying with modified pollution control requirements at facilities that emit more than 10 tons a year, the EPA said.

The proposal follows other moves by the Trump administration to rescind regulations that it says are burdensome and costly for industries, such as those governing emissions from coal power plants. Last month, the EPA repealed the endangerment finding, which affirmed the dangers of greenhouse gas emissions and underpinned the agency’s ability to regulate those emissions from vehicles.

The action around ethylene oxide would affect about 90 commercial sterilization facilities owned and operated by approximately 50 companies. Three California companies applied for and received presidential exemptions for their EtO emissions in July.

The Sterigenics facility, center, in Vernon is pictured in 2022.

(Myung J. Chun / Los Angeles Times)

They are located in Ontario and Vernon and operated by the company Sterigenics, which provides industrial sterilization technology for medical devices and other commercial products.

In January, a coalition of environmental and community groups challenged the EtO exemptions in federal court. The lawsuit from the Southern Environmental Law Center and the Natural Resources Defense Council argues that technology exists for facilities to comply with the tighter Biden-era standards without raising costs, and many facilities are already using it.

“EPA’s 2024 rule was an important and overdue step to reduce toxic ethylene oxide pollution and protect communities,” said Irena Como, senior attorney at the Southern Environmental Law Center, in a statement Friday. “Repealing this rule that is proven to significantly lower pollution exposure and cancer risks will subject even more people who work, live, and send their children to schools located near these facilities to harm that is entirely preventable.”

Sterilization and chemical industry groups support the plan.

“The EPA rule concerning ethylene oxide use in commercial sterilizers threatens to severely restrict access to vital medical products nationwide,” the American Chemistry Council said in a statement. “We commend the EPA for their commitment to reevaluating these policies.”

The EPA will hold a 45-day comment period about the proposal after it is published in the federal register. A final decision is expected sometime this year.

SACRAMENTO — Gov. Gavin Newsom told world leaders Friday that President Trump’s retreat from efforts to combat climate change would decimate the U.S. automobile industry and surrender the future economic viability to China and other nations embracing the transition to renewable energy.

Newsom, appearing at the Munich Security Conference in Germany, urged diplomats, business leaders and policy advocates to forcefully stand up to Trump’s global bullying and loyalty to the oil and coal industry. The California governor said the Trump administration’s massive rollbacks on environmental protection will be short-lived.

“Donald Trump is temporary. He’ll be gone in three years,” Newsom said during a Friday morning panel discussion on climate action. “California is a stable and reliable partner in this space.”

Newsom’s comments came in the wake of the Trump administration’s repeal of the endangerment finding and all federal vehicle emissions regulations. The endangerment finding is the U.S. government’s 2009 affirmation that planet-heating pollution poses a threat to human health and the environment.

Environmental Protection Agency administrator Lee Zeldin said the finding has been regulatory overreach, placing heavy burdens on auto manufacturers, restricting consumer choice and resulting in higher costs for Americans. Its repeal marked the “single largest act of deregulation in the history of the United States of America,” he said.

Scientists and experts were quick to condemn the action, saying it contradicts established science and will put more people in harm’s way. Independent researchers around the world have long concluded that greenhouse gases released by the burning of gasoline, diesel and other fossil fuels are warming the planet and worsening weather disasters.

The move will also threaten the U.S.’s position as a leader in the global clean energy transition, with nations such as China pulling ahead on electric vehicle production and investments in renewables such as solar, batteries and wind, experts said.

Newsom’s trip to Germany is just his latest international jaunt in recent months as he positions himself to lead the Democratic Party’s opposition to Trump and the Republican-led Congress, and to seed a possible run for the White House in 2028. Last month Newsom traveled to the World Economic Forum in Davos, Switzerland, and in November to the U.N. climate summit in Belém, Brazil — mocking and condemning Trump’s policies on Greenland, international trade and the environment.

When asked how he would restore the world’s confidence in the United States if he were to become president, Newsom sidestepped. Instead he offered a campaign-like soliloquy on California’s success on fostering Tesla and the nation’s other top electric vehicle manufactures as well as being a magnet for industries spending billions of dollars on research and development for the global transition away from carbon-based economies.

The purpose of the Munich conference was to open a dialogue among world leaders on global security, military, economic and environmental. Along with Friday’s discussion on climate action, Newsom is scheduled to appear at a livestreamed forum on transatlantic cooperation Saturday.

Andrew Forrest, executive chairman of the Australia-based mining company giant Fortescue, said during a panel Friday his company is proof that even the largest energy-consuming companies in the world can thrive without relying on the carbon-based fuels that have driven industries for more than a century. Fortescue, which buys diesel fuel from countries across the world, will transition to a “green grid” this decade, saving the company a billion dollars a year, he said.

“The science is absolutely clear, but so is the economics. I am, and my company Fortescue is, the industrial-grade proof that going renewable is great economics, great business, and if you desert it, then in the end, you’ll be sorted out by your shareholders or by your voters at the ballot box,” Forrest said.

Newsom said California has also shown the world what can be done with innovative government policies that embrace electric vehicles and the transition to a non-carbon-based economy, and continues to do so despite the attacks and regressive mandates being imposed by the Trump administration.

“This is about economic prosperity and competitiveness, and that’s why I’m so infuriated with what Donald Trump has done,” Newsom said. “Remember, Tesla exists for one reason — California’s regulatory market, which created the incentives and the structure and the certainty that allowed Elon Musk and others to invest and build that capacity. We are not walking away from that.”

California has led the nation in the push toward EVs. For more than 50 years, the state enjoyed unique authority from the EPA to set stricter tailpipe emission standards than the federal government, considered critical to the state’s efforts to address its notorious smog and air-quality issues. The authority, which the Trump administration has moved to rescind, was also the basis for California’s plan to ban the sale of new gasoline-powered cars by 2035.

The administration again targeted electric vehicles in its announcement on Thursday.

“The forced transition to electric vehicles is eliminated,” Zeldin said. “No longer will automakers be pressured to shift their fleets toward electric vehicles, vehicles that are still sitting unsold on dealer lots all across America.”

But the efforts to shut down the energy transition may be too little, too late, said Hannah Safford, former director of transportation and resilience at the White House Climate Policy Office under the Biden administration.

“Electric cars make more economic sense for people, more models are becoming available, and the administration can’t necessarily stop that from happening,” said Safford, who is now associate director for climate and environment at the Federation of American Scientists.

Still, some automakers and trade groups supported the EPA’s decision, as did fossil fuel industry groups and those geared toward free markets and regulatory reform. Among them were the Independent Petroleum Assn. of America, which praised the administration for its “efforts to reform and streamline regulations governing greenhouse gas emissions.”

Ford, which has invested in electric vehicles and recently completed a prototype of a $30,000 electric truck, said in a statement to The Times that it appreciated EPA’s move “to address the imbalance between current emissions standards and consumer choice.”

Toyota, meanwhile, deferred to a statement from Alliance for Automotive Innovation president John Bozzella, who said similarly that “automotive emissions regulations finalized in the previous administration are extremely challenging for automakers to achieve given the current marketplace demand for EVs.”