Federal and state officials say the temporary sites for processing hazardous waste pose no threat, but residents are worried about their air and water.

Emboldened by President Trump, West Virginia and other states are challenging the Climate Change Superfund Act, which makes corporate polluters pay for past emissions.

President Trump is expected to close the office as he cuts programs to help poor and minority communities that are disproportionately affected by pollution.

Many fire victims are eager to clear their home sites and move on to rebuilding. The big question is when.

The pause affects billions of dollars and is delaying home repairs, factory construction and other projects, many in states that voted Republican.

The former New York congressman has little experience in environmental policy. He is expected to follow orders to weaken climate rules.

Top political appointees are already at the E.P.A. preparing to erase the agency’s climate rules and pollution controls. Many of them have tried it before.

President Trump’s wave of executive orders yesterday sent an undeniable signal to the world about the United States’ role in fighting climate change.

Agencies and unions have put in place new guardrails designed to limit political interference in government research.

Hino Motors, a Toyota subsidiary, will plead guilty to conspiracy charges and pay penalties for deceiving regulators about its diesel engines, the E.P.A. said.

Mr. Zeldin, a Trump loyalist, would be charged with dismantling climate rules and perhaps the agency itself. He faced questions from the Senate Thursday.

State regulators said the measures would probably have been rejected by the Trump administration and that they would focus on homegrown legal strategies instead.

How to understand the E.P.A.’s new warning about PFAS levels in sewage sludge.

Levels of PFAS in sewage sludge used as fertilizer can pose risks that sometimes exceed safety thresholds “by several orders of magnitude,” the agency said.

Wastewater, even after treatment to make it drinkable, contains high levels of PFAS, according to researchers.

Communities must be able to move to solid ground while remaining whole.

Forty-four years ago, Ronald Reagan took aim at Jimmy Carter’s environmental legacy. President Biden’s climate initiatives could face a similar fate.

The agency obtained research from 3M in 2003 revealing that sewage sludge, the raw material for the fertilizer, carried toxic “forever chemicals.”