Haze blanketed Colorado on Monday as wildfire smoke drifted from Canada, and the gray skies are expected to hover overhead for at least another 24 hours.
The wildfire smoke led the Colorado Department of Public Health and Environment and the Regional Air Quality Council on Monday to issue public health advisories, recommending people limit outdoor activity. The smoke is increasing the amount of ozone and fine particulate matter in the air.
Air monitors across northern Colorado and the Front Range were showing high concentrations of particulate matter, which can be smoke, soot, ash or liquid particles that people can inhale.