"The EPA’s Denver regional office is once again blocking a renewed state air pollution permit for the Suncor refinery in Commerce City, agreeing to objections from environmental groups that Colorado should crack down harder on carbon monoxide dangers and past plant modifications."

"Southeast Asian nations are gearing up to tackle the threat of a tougher-than-usual "haze" season together, as the El Nino climate phenomenon raises the risk of soaring temperatures."

"California is poised to become the first state in the country to adopt special measures to protect workers who make kitchen and bathroom countertops out of a popular kind of artificial stone known as "quartz.""

"When large ships use scrubbers to meet international air pollution limits, the treated fuel exhaust gets dumped into the sea along with other contaminants. Researchers say the discharges are packed with metals and organic compounds that threaten marine environments."

"Language blocking a ban on gas stoves has been incorporated into a bipartisan Senate appropriations bill, giving it a significant chance to ultimately become law."

"Proposed EPA methane limits may help curtail 7,500 yearly deaths from oil and gas production sites."

"When Mississippi environmental regulators checked the emissions of a large wood pellet mill operating a few miles from the Louisiana line, they found pollution levels two times higher than the legal limit."

"Some of the largest manufacturers of heavy trucks and engines in the country have agreed to accept a California plan to ban sales of new diesel big rigs by 2036 under a deal aimed in part at thwarting potential litigation and maintaining a single national standard for truck pollution rules."