Some Eastern Washington counties are under a burn ban until Monday morning.
The state Department of Ecology declared a stage 1 burn ban for several counties including Walla Walla, Columbia, Asotin and Garfield starting at 4 p.m. Saturday.
Cold air apparently is trapping smoke pollution near the ground and causing an air quality concern, according to the department.
All outdoor burning, including residential, agricultural and forest burning, is prohibited.
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Fireplaces and uncertified wood stoves must not be used during the ban unless they are the home's only source of heat. Certified wood-burning devices and pellet stoves are allowed.
The ban continues until 10 a.m. Monday.