Emissions

Emissions standards are closely linked with fuel economy requirements because vehicles pollute less if they burn fewer gallons of fuel.

The oil and gas industry is the nation's primary source of methane emissions, according to the EPA, accounting for nearly one-third in 2016.

The Bureau of Land Management said in a statement the rule was revised to cut back the regulatory burden.

Environmental groups promise court challenges to both rollbacks.

The rule required energy companies to capture methane gas instead of burning it or wasting it at drilling sites on public lands.

Mead says the Obama plan usurped state regulatory authority.

In this round, the state will get some $8-million from the pool set up as part of the settlement.

About 1,200 vehicles in Wyoming were affected by the technology.

The Wyoming lawsuit is associated with litigation entitled "Volkswagen 'Clean Diesel' Marketing, Sales Practices, and Products Liability Litigation" filed in the Northern U.S. District Court in San Francisco.

Shane Murphy, assistant professor in the UW Department of Atmospheric Science, is specifically examining the effects of black and brown carbon emitted from wildfires.