As of Friday, 10 counties had air quality that the Environmental Protection Agency considers "unhealthy."
Particle air pollution causes northern Chinese people to die about three years before those in the southern region.
The Front Range is under an Ozone Action Day Alert.
An Ozone Action Day Alert was issued due to ground-level ozone in the baking summer sun.
The American Lung Association says ozone pollution has improved in both Denver and Fort Collins, but both are still among the 15 worst in the…
The 80216 zip code includes Elyria-Swansea, Globeville and part of the River North neighborhood.
Fires in Denver, along with heavy traffic, have created dangerous air conditions for some.
Colorado voters, and politicians, play a lot of attention to environmental issues.
Ten pigeons wearing special high-tech backpacks were set free in London to track pollution levels at spots in the city.
A Los Angeles County official says he wishes air pollution monitoring had been more comprehensive after a natural gas leak was reported in…