open air

(noun) where the air is unconfined. Synonyms: outdoors, out-of-doors, open. Examples: "He wanted to get outdoors a little." "The concert was held in the open air." "Camping in the open."

(adj) in the open air. Synonyms: alfresco, open-air(prenominal). Examples: "An alfresco lunch." "An open-air theater."