Fires prompt air quality concerns across Colorado

DENVER -- As several fires burn across Colorado, smoke filters through the state, impacting air quality for some and prompting alerts from agencies. 

The Colorado Department of Public Health and Environment announced from Thursday morning through Friday morning an air quality health advisory purely due to smoke in Fremont County. 

Hayden Pass smoke is filtering through that area, prompting the advice of staying indoors when the air becomes contaminated. 

Public Health officials also announced an Ozone Action day across the Front Range Urban Corridor from El Paso County north to Larimer and Weld counties, including the Denver-Boulder area, Colorado Springs, Fort Collins and Greeley due to both smoke and heavy car traffic. 

In both cases, officials say those with pre-existing conditions like heart disease, asthma, respiratory illness, the very young and the elderly should take special caution.