SPOKANE, Wash. -

Drifting wildfire smoke has lowered air quality in much of Eastern Washington and parts of northern Idaho.

The Washington Ecology Department and the Idaho Department of Environmental Quality have issued an air quality alert.

They say smoke particles could irritate eyes and noses and aggravate heart and lung disease. Vulnerable people are advised to remain indoors. Favorable weather with a chance of rain midweek should clear the air.

The alert covers Adams, Asotin, Chelan, Douglas, Ferry, Garfield, Grant, Lincoln, Okanogan, Pend Oreille (pahn duh-RAY'), Spokane, Stevens and Whitman counties in Washington.  And Latah, Lewis and Nez Perce counties in Idaho.