The Biden administration could be close to restoring California’s authority to adopt tailpipe emission standards that are more stringent than federal standards.

The Supreme Court agreed to consider challenges to EPA’s authority to regulate greenhouse gas emissions under the Section 111(d) of the Clean Air Act.

Nevada's Clean Cars regulations will take effect in 2025, but the state is allowing auto makers to bank ZEV credits starting next year.

Feedback split along predictable lines on Washington’s efforts to adopt California’s strict standards on zero-emission medium- and heavy-duty trucks.

Nevada is seeking approval for a program to tighten vehicle emission standards and increase availability of electric cars.

New York officials told stakeholders the state hopes to adopt medium- and heavy-duty zero emission vehicle standards by the end of the year.

A new report recounts actions state attorneys general took to mitigate the Trump administration’s weakening of regulations on energy and climate.

President-elect Joe Biden should avoid the mistakes President Barack Obama made in attempting to reduce emissions, environmental law experts said.

SPP has been tasked with providing an outline of comments for submittal to the EPA in response to its proposed rulemaking under Clean Air Act Section 111b.

Republicans are working on legislation that could allow power plants to avoid expensive upgrades under the EPA New Source Review (NSR) program.