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The study was conducted in a facility for pigs during the nursery and finishing in the town of 'Montadas', in the semiarid of the state of Paraiba, Brazil, in the rainy and dry season, aiming to evaluate the concentration of oxygen, methane, carbon monoxide and ammonia, and the bioclimatic indexes: ambient temperature (AT), relative humidity (RH) and the index of black globe temperature and humidity (IBGTH). These indexes differed significantly (P>0.05) between the periods and times. The AT in the rainy season was in the thermal comfort zone(TCZ) in most of the times in the nursery; for the finishing phase, thermal discomfort occurred; during the dry season, there was thermal comfort in the nursery phase; in the finishing phase the thermal discomfort occurred at all times. In the rainy season, the IBGTH was in TCZ; in the dry season, it was above the TCZ. The RH in the rainy period was in the TCZ; in the dry season, in most of the times, below the range of the TCZ. The concentration of gases showed no differences (P > 0.05) between periods and between the times, and the carbon monoxide, hydrogen sulfide and methane were below 1.0 ppm, and the ammonia showed a mean of 5.2 ppm. None of the analyzed gases exceeded the limits established by Brazilian and international standards for animals and workers. A pesquisa foi desenvolvida em uma instalação para suínos, na fase de creche e terminação, no município de Montadas, semiárido paraibano, nos períodos chuvoso e seco, com o objetivo de avaliar a concentração dos gases oxigênio, metano, monóxido de carbono e amônia, e os índices bioclimáticos: temperatura ambiente (TA), umidade relativa do ar (UR) e índice de temperatura de globo e umidade (ITGU). Estes índices diferiram significativamente (P < 0,05) entre os períodos e horários. A TA no período chuvoso ficou na zona de conforto térmico (ZCT) na maior parte dos horários na creche; para a fase de terminação, ocorreu desconforto térmico; no período seco, houve conforto térmico para a creche; na terminação, desconforto térmico em todos os horários. No período chuvoso, o ITGU ficou na ZCT; no período seco, acima da ZTC. A UR no período chuvoso esteve na ZTC; no período seco, na maior parte dos horários, abaixo da faixa da ZTC. A concentração de gases não apresentou diferenças (P > 0,05) entre os períodos e os horários, sendo que o valor de monóxido de carbono, gás sulfídrico e metano ficou abaixo do 1,0 ppm, e a amônia apresentou média de 5,2 ppm, sendo que nenhum dos gases analisados ultrapassou os limites estabelecidos pelas normas brasileiras e internacionais para animais e trabalhadores

Thermal performance and concentration of gases in facilities for pigs in semiarid region from State of Paraiba - Brazil