More from the article...

... The justices denied emergency requests by the states, as well as power and mining, oil and gas companies, to halt the Environmental Protection Agency rules while litigation continues in lower courts.

The regulations, issued under the landmark Clean Air Act anti-pollution law, aim to cut mercury and other metals from coal-fired power plants emissions, as well methane and other gases known as volatile organic compounds from oil and gas production.

The mercury rule tightened limits on emissions of toxic metals for all coal plants by 67% and tightened limits on mercury emissions from lignite coal plants by 70%.

The methane rule restricted flaring -- the burning of excess methane during oil and gas production -- and required oil companies to monitor for leaks from well sites and compressor stations. It also created a new program for detecting and reporting large methane releases from so-called "super emitters." ...