Pima County Thursday issued a "smoke advisory" because of smoke drifting into Southern Arizona from wildfires in New Mexico.
The advisory, in a press release from the county Department of Environmental Quality, said, "people living in the area who are sensitive to smoke are urged to take appropriate precautions if they smell smoke."
Symptoms of sensitivity to smoke include itchy eyes, coughing, and upper-airway irritation. Other possible health effects are headache, dizziness and nausea, the press release said.
It advised people with conditions such as asthma or other respiratory problems to avoid exposure to smoke, reduce level of exertion, close doors and windows and use air conditioning rather than evaporative cooling.