(Salem, OR)  --  Wildfire smoke is prompting Oregon DEQ to issue an air quality advisory for south central and northeast Oregon.  The advisory covers Jackson, Klamath, Lake, and Wallowa counties along with parts of Deschutes and Douglas counties.  It lasts until at least Friday.  People should stay indoors, avoid strenuous outdoor activity and if you have lung disease or asthma, follow the advice of your health care provider.