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Continuous measurements of ammonia and greenhouses gases were achieved on exhaust air from two fattening rooms differing by the type of floor (totally slatted floor vs. partially slatted floor) and the ambient temperature. Temperature was regulated at 18C in the room with partially slatted floor (room PSF18) and 24C in the room with fully slatted floor (FSF24). Pigs were fed ad libitum. Daily feed intake, growth rate and carcass backfat thickness were significantly higher for PSF18 pigs than for FSF24 ones, corresponding to a higher feed conversion ratio for PSF18 pigs. Under cold conditions (18C), the N-NH3, N-N2O, C-CH4 and C-CO2 daily emissions per pig on partially slatted floor were similar to those on fully slatted floor under thermoneutral conditions (FSF24: 8.90.12-7.3 and 676 g, PSF18: 9.10.15-8.4 and 629 g/pig, respectively). A further reduction of ammonia emission from pig units on partially slatted floor would require a more pronounced reduction of ambient temperature. However, in such conditions, a deterioration of feed conversion ratio and carcass leanness may be expected. Thus, the extra-cost induced by the utilization of partially slatted floor in cold ambient conditions would not be acceptable with regard to the definition of Best Available Techniques given by the IPPC directive.