Ozone Advisory for Western Wyoming

State regulators have issued the first ozone advisory in western Wyoming's gas fields in more than two years and are telling people sensitive to air pollution to take precautions.

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High levels of ozone are associated with smog, which the Associated Press reports sometimes smudge the sky in the upper green river basin when conditions are right during the winter.

Those conditions include snow on the ground, bright sunshine and air pollutants including nitrogen oxides and volatile organic compounds.

The Wyoming Department of Environmental Quality says high levels of ozone are possible in the basin Monday and Tuesday. The department says children, the elderly and people with respiratory conditions should limit strenuous or extended outdoor activity.

Petroleum companies operating in the area say they're taking steps to reduce air pollution during the ozone advisory.