Thursday Smoke, Pollution Forecast For Metro Denver, Boulder

Smoke is continuing to flow into metro Denver and Boulder from the Cameron Peak and Mullen wildfires, and another action day alert has been issued for the Front Range, public health officials said.

Fine particulate matter concentrations from the smoke are expected to be in the 'unhealthy' to 'unhealthy for sensitive groups' categories on Thursday, according to the Colorado Department of Public Health and Environment.

"The heaviest smoke is most likely in Larimer and Weld counties, including Ft. Collins and Greeley, due to smoke transported from the Cameron Peak wildfire in western Larimer County and the Mullen wildfire in south-central Wyoming," the agency said in an air quality advisory.

"Periods of light to moderate smoke will be likely for other parts of the Front Range, though a general increase in smoke will be possible for areas south of Ft. Collins during the day on Thursday, including the Longmont, Boulder and Denver areas."

Visibility along the Front Range is expected to be in the 'poor' category Thursday, public health officials said.

Ozone concentrations in metro Denver and Boulder are expected to be in the 'good' to 'moderate' categories.

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Carbon monoxide and nitrogen dioxide levels will remain in the 'good' category on Thursday, health officials said.

>> Read the full air quality advisory here.