This study objective was to assess the air quality by measuring gas concentrations, and assess the surface and inside temperatures of deep litter materials in a finishing swine building. The experiment was conducted during the months of June and July. It was compared three treatments: deep litter composed of shaving woods + sugarcane bagasse (M+B), deep litter composed of sugarcane bagasse (BAG) and deep litter consisting of shaving woods (MAR). The installation stalls had a concrete floor under the deep litter. Measurements of instantaneous concentrations of ammonia, NH₃ (ppm), carbon dioxide (CO₂ ppm) and carbon monoxide (CO, ppm) at the level of the animals were taken. Data relating to surface temperature and inside the deep litter for swine were collected at three different points within the stalls (center, in the frontal region and background of the stalls). It was observed that the "MAR" deep litter showed the highest average concentration of NH₃ (2.88 ppm). The "BAG" deep litter showed the lowest values of NH₃ for all time intervals evaluated. In the morning period was observed significant differences for all treatments. The highest CO₂ concentration (1530 ppm) was observed in treatment "BAG" at 11 h 30 min. The surface temperatures of deep beddings showed no significant differences between the sampling points. The temperature inside the deep litter at the front of the stall treatment was higher (M+B) when compared to treatment (ABG) and (MAR). The concentration of CO, CO₂ and NH₃, measured, gases not reached levels that could cause harm to the health of animals.