New EPA tests show elevated levels of metal affecting the air quality in Pueblo. The results are linked to a smelter that was designated a Superfund site in 2014.
The challenge asked cities to come up with innovative solutions to big problems that other cities could copy.
A replacement rule from the Interior Department rescinds mandates for companies to reduce gas pollution.
Microscopic inhalable particles from wildfire smoke can get deep into the lungs and play havoc with those who suffer from heart and respiratory issues.
Emily Fischer and her team pilot a specially outfitted aircraft to research smoke and air quality.
Study co-author Ivan Rudik said air quality warnings issued by parks and other government agencies may be causing the visitation drop.
John Hickenlooper on Tuesday told state regulators to try to have California-style low-emission vehicle standards in place by the end of the year.
“This is the most surprising and unexpected thing that I’ve observed in 27 years of making these measurements,” researcher Steve Montzka says.
This week the head of the Environmental Protection Agency, Scott Pruitt, announced the federal government would rollback emissions standards for automobiles.
Interior had previously announced it was delaying the Obama-era rule until January 2019, arguing that it was overly burdensome to industry.