LINCOLN, Neb. (AP) — Officials say air conditions that prompted a health advisory from the Lincoln-Lancaster County Health Department could continue into Thursday.

The advisory says the unhealthy smoke levels are caused by agricultural burns in the Flint Hills area of Kansas and areas in Nebraska east of Beatrice.

The advisory says the problem may last through Thursday because of winds from the south and relatively low wind speeds.

The advisory says older adults and children and people with asthma, lung disease or other respiratory conditions or heart disease to stay indoors and avoid strenuous activity.