CARLTON, Ore. (AP) — More than a dozen people were exposed to carbon monoxide at pork and beef facility southwest of Portland. KATU-TV reports Yamhill County Fire says the Carlton Farms retail and packaging areas were evacuated just after 11:30 a.m. Monday after carbon monoxide spread through the air conditioning system. In total, authorities say 17 people were treated for carbon monoxide exposure. Authorities say eleven of those people were transported to local hospitals with symptoms including nausea, vomiting and headaches.