THESAURUS
open air
aerial, aeriform, aery, airish, airlike, airy, alfresco, atmospheric, breezy, ethereal, exposed, light, open, out, out-of-door, out-of-doors, outdoor, outside, pneumatic, roomy, tropospheric, without
ROGET THESAURUS
open air
Air
N
air, common air, atmospheric air, atmosphere, aerosphere,
open air, sky, welkin, blue sky, cloud, weather, climate, rise and fall of the barometer, isobar, aerology, aerometry, aeroscopy, aeroscopy, aerography, meteorology, climatology, pneumatics, eudioscope, baroscope, aeroscope, eudiometer, barometer, aerometer, aneroid, baroscope, weather gauge, weather glass, weather cock, exposure to the air, exposure to the weather, ventilation, aerostation, aeronautics, aeronaut, containing air, flatulent, effervescent, windy, atmospheric, airy, aerial, aeriform, meteorological, weatherwise, in the
open air, a la belle etoile, al fresco, sub jove dio.