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The American Lung Association’s annual air quality report shows that some of the most polluted air is in the areas around Las Vegas, Phoenix, Denver, and Salt Lake City, but some of the cleanest is in the mountain areas in Wyoming, Colorado, St. George, Utah, and Prescott Valley, Ariz.

Tri-State Generation is reviewing executive orders, but says its plan to close all three coal-fired units at Craig Station is based on economics. Listen to "Morning Edition" host Michael Lyle, Jr. discuss this story with Colorado Sun reporter Mark Jaffe and then read the Colorado Sun story at the link below.

Boulder County awaits the Lyons cement plant’s appeal of show-cause orders, as activists fight the industrial site on multiple fronts.

Rosemarie Russo was questioned and then lost her job after sending frank anti-pollution appeals from residents to Suncor’s Canada headquarters.

The University of California Davis Health system has developed a system to identify such at-risk patients and ensure they have access to care during heavy smoke events. Researchers there are calling for other health systems in smoke-impacted communities to adopt a similar approach.

Haze and smoke settled into the front range last week, and it’s about to get worse. Air quality will dip as wildfire smoke mixes with urban pollution.

You may have noticed the haze that has settled over the Front Range in the last few days. And you might have gotten a push notification alerting you to the poor air quality. But what should you do with that? We’ll hear about what these notifications mean for your health on today’s In the NoCo.

A study focused on the Great Salt Lake in Utah looked at the correlation between decreasing water levels and and increase in harmful air particles. It's an issue that could affect other lakes around the country.

When toxic gasses leak into the atmosphere, they are impossible to see. But scientists at CU Boulder are designing a technology to detect chemical threats.

A new report from the American Lung Association shows cities across the Western U.S. have some of the most polluted air in the country. But that’s not the case everywhere in the Mountain West.