MEDFORD, Ore. — State officials have issued an air stagnation advisory for parts of southern Oregon through Saturday evening.
The Oregon Department of Environmental Quality issued the alert Thursday.
The advisory includes parts of eastern Curry County and Josephine and Jackson counties and the inland valley cities of Grants Pass, Cave Junction, Medford, Merlin, Gold Hill, Williams and Ashland.
Forecasters expect an inversion over these areas, which include conditions of high pressure, cold surface temperatures and limited mixing in the air. During an inversion, smoke can be trapped at ground level where people breathe.
Officials ask people in the affected areas to limit outdoor burning and the use of uncertified woodstoves.
Scientific studies have linked smoke pollution to problems including coughing, aggravated asthma, bronchitis and irregular heartbeat.