The U.S. Supreme Court on Friday batted away several industry and state challenges to recent U.S. Environmental Protection Agency rules imposing tougher standards on coal plants and oil and gas facilities.

The court's decisions leave in place new EPA regulations that, in one case, force coal facilities to reduce mercury and other toxic emissions within three years and, in another, require states to quickly adopt plans to reduce methane and "volatile organic compound" emissions from oil and gas wells and plants.