Democratic Gov. Gavin Newsom has signed into law a bill that directs the California Air Resources Board and other state agencies to develop and implement a new smog inspection program for heavy-duty diesel on-road trucks.

The Trump administration will announce it is rescinding California’s authority to regulate greenhouse gas emissions from automobiles at an event at the EPA’s Washington headquarters Sept. 18, according to people familiar with the matter.

Four major automakers have reached a secret deal with California to increase gas mileage and greenhouse gas emissions standards, bypassing the Trump administration’s plan to freeze standards at 2021 levels, according to two people briefed on the matter.

Wrapping up an investigation begun four years ago, the California Air Resources Board announced July 1 it fined brewing company Anheuser-Busch $500,000 for medium- and heavy-duty trucks that violated the state’s air pollution laws.