Tri-Citians can expect air quality to be affected by wildfires at least until noon Monday.
The Washington Department of Ecology has extended the air-quality alert for the Tri-Cities and surrounding areas until then.
Smoke is expected to affect areas in and around the Columbia Basin.
Air quality was moderate Friday evening in the Tri-Cities, close to being unhealthy for sensitive groups.
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Members of sensitive groups may experience health effects, according to the National Weather Service.
There is a ban on all outdoor burning in Eastern Washington through midnight Sunday.