Air Pollution Control Division
Some of the worst ozone pollution in the U.S. settles along the Front Range. New rules to fix it are ahead.
Colorado has made some progress toward reducing the chemical dangerous to human health. But it will take leaning on automobiles and oil and gas producers to really move the needle.
Environmental groups demand Polis remove Colorado Air Pollution Control director, call for independent investigation
A whistleblower complaint filed Tuesday accused state air regulators of illegally approving permits, telling staff to falsify records
Coalition demands fence line monitors, tougher caps at Suncor to protect Colorado communities
Activists and legislators from Denver and Pueblo want the state to put teeth into environmental justice for communities of color.
First-in-the-nation rule to slash methane emissions from Colorado oil and gas operations relied on compromise
Industry and environmental groups worked out a way to reduce emissions from new wells and old ones that contribute to Colorado’s ozone problem.
Three coal-burning power plants in Colorado face orders to close early. Their owners aren’t happy about it.
Tri-State, Xcel and Platte River Power had the closures slated for 2030. But Colorado air quality regulators say it must be done earlier to meet greenhouse gas targets.
Colorado oil and gas emissions rules begin to tighten, but gaps open over what is monitored, by whom and where
Western Slope commissioners say rules designed to pull the Front Range into federal ozone compliance are an “economic risk” for northwest Colorado
Drafting rules to reduce Colorado’s greenhouse gas emissions may prove even harder because of missing data
The state's Air Quality Control Commission doesn’t expect new rules to be in place for another year
Colorado counties sue state over new air-quality regulations
Garfield and Mesa counties joined seven other counties in the lawsuit against the state Air Quality Control Commission, Air Pollution Control Division and Department of Public Health and Environment
The fierce debate over Colorado’s new zero-emissions rules includes auto dealers who are meeting future standard
The proposed ZEV rules aren't a fix for Colorado's air-quality problems, officials say. If adopted, nearly 94% of new cars sold in 2030 could still be gas-powered vehicles.
As Colorado considers an electric-vehicle mandate, here’s what to expect
Here’s the data behind some of the arguments that will be made as the state considers adopting an electric vehicle policy to improve air quality
A tiny garden in Boulder is showing signs of stress from smog. The scientist behind it is thrilled.
Four types of plants growing near the entrance to NCAR are part of a nationwide network of gardens where citizen scientists and climate researchers collect data about the impact of ground-level ozone
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
Colorado votes 8-0 to join California’s low-emission vehicle standard
Opponents say the adoption is unnecessary and will lead to higher prices. But a state agency's research shows $1,682 in fuel savings and greenhouse gas reduction by 2031.