Air quality in animal production environment has been refereed as an interesting point for studies in environmental control systems with the focus both to the animal health which live in total confinement, as to the workers. The objective of this research was to determine the variation on the aerial environmental quality in two types of broiler housing: conventional (G c) and tunnel type (G t). The total dust values in both houses offered adequate rearing conditions to the birds; however, regarding the inhale dust in the air was above the limits recommended for humans. Carbon monoxide concentration in the heating phase during the evaluated period was above the 10 ppm maximum recommended, and it was higher during the cold season in G t house (30 ppm) when compared to the G c house (18 ppm). Ammonia concentration peaks in the air were above the 20 ppm recommended from the 20 th day of production in both houses and in daily average, for a period higher in G t (4h30) when compared to G t (2h45). Only traces of nitrate oxide and methane were found while carbonic dioxide gas concentration evaluated during daytime met the limits allowed for both birds and labor.272326335AARNIK, A.J.A.ROELOFS, P.F.M.M.ELLEN, H.GUNNIK, H. Dust Sources in Animal Houses. In: INTERNATIONAL SYMPOSIUM ON DUST CONTROL IN ANIMAL PRODUCTION FACILITIES, 1., 1999, Aarhus. Proceedings... Aarhus: Danish Institute of Agricultural Sciences, 1999. p 34-40ABREU, P.G.BAÊTA, F.C.ABREU, V.M.N.SOARES, P.R.PERDOMO, C.C.SILVA, M.A. Umidade da cama e teor de amônia em diferentes sistemas de aquecimento de frangos de corte. In: CONFERÊNCIA APINCO, 16., 1998, Campinas. Anais... Campinas: Fundação Apinco de Ciência e Tecnologias Avícolas, 1998. p.68ACGIH. AMERICAN CONFERENCE OF GOVERNMENTAL INDUSTRIAL HYGIENISTS. 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