The EPA’s final rule also could impact Colorado’s zero-emissions mandate
The EPA will hold a Friday hearing on whether to lower the ozone status of Denver and eight other northern Colorado counties from "moderate" to "serious"
Auto dealers say electric car mandate — a cornerstone of Colorado’s clean air quest — is a threat to tradition
Lowering emissions is a top priority in Colorado, but a look at how dealerships make money — parts, upgrades and financing — shows why dealers aren't happy about the plan to get more zero emission vehicles on the road
The move was expected after Democratic Gov. Jared Polis said in March the state wouldn't ask for an exemption based on pollution drifting into Colorado from China and elsewhere
Court upholds Trump move to drop mine pollution rule forcing companies to show their clean-up ability
The mining industry has a legacy of bankrupt companies abandoning polluted sites and leaving taxpayers to cover cleanup costs.
Front Range air quality is terrible, but Colorado’s efforts are showing some improvement in ozone pollution
A slate of new laws is expected to speed up air-quality improvements, but Denver still hasn't met standards that the EPA set more than a decade ago
Local plants vow to minimize coal-ash contamination to meet new EPA rules; report finds cases much worse in other states
A little-known Colorado law written to protect recycling stands is in the way of cities that want to outlaw straws, plastic grocery bags and Styrofoam containers