Light winds from the northwest are forcing smoke from several western wildfires into the Front Range.
More than 200,000 acres are burning in the western part of the United States currently.
The smoke from those fires -- as well as from the Beaver Creek Fire (6,235 acres) in Jackson County in northern Colorado -- have created poor air quality along the Front Range.
An Air Quality Advisory is in effect for Jackson County and parts of Boulder and Larimer counties for thick smoke. People with respiratory problems are being advised to stay indoors as much as possible in these areas.
In general, when visibility is less than five miles, air quality is considered to be unhealthy for anyone.
In addition to the thick smoke, an Ozone Action Day is in effect for the Denver metro area through 4 p.m.
Cooler, wetter weather will move in Thursday and Friday which should improve the air temporarily.