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The Mullen fire, burning in south-central Wyoming, has spread into Colorado and the fire has burned 117,420 acres, about 183 square miles, since starting on Sept. 17.

The fire on Wednesday, energized by strong winds and dry conditions, ran several miles in just under 90 minutes, fire officials said on InciWeb.

Firefighters performed burnout operations along the Colorado state line in an attempt to slow the fire and reduce it from spreading into northwestern Larimer County, where evacuations were ordered on Wednesday. Firefighters are concentrating on attempts to keep the fire north and west of Colorado 127.

The most severe extension of the fire burning into Colorado has been into Jackson County, according to mapping. Evacuations have been ordered in Jackson County.

Smoke from the Mullen fire has been shading the Cameron Peak fire the past few days. Diminished sunlight has helped cool down the Cameron Peak fire by about 5 to 7 degrees, fire officials said. Thursday’s daytime temperatures ranged from the mid-50s into the 60s.

The Cameron Peak fire has burned 125,006 acres, about 195 square miles, and is 30% contained as of Thursday. The Larimer County Sheriff’s Office lifted voluntary evacuations for County Road 44H from County Road 27 to Pennock Pass as part of its Cameron Peak fire planning.

The two fires, Mullen and Cameron Peak, are a roughly just over 20 miles apart, from Mullen’s southeast corner to Cameron Peak fire’s northwest edge, according to mapping.

Smoke from the two fires, and other Colorado wildfires, has been adversely impacting air quality along the northern Front Range and the metro area. An “Action Day for Particulates” has been declared by the Colorado Department of Public Health and Environment.

Areas under the posting are: Douglas, Jefferson, Denver, western Arapahoe, western Adams, Broomfield, Boulder, Larimer, and Weld counties.

Fine particulate concentrations are in the “Unhealthy for Sensitive Groups” category. People with heart disease, respiratory illnesses, the very young, and seniors are advised to limit time outdoors.

This content was originally published here.