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Ammonia and hydrogen sulfide emissions were measured from a 2000-head tunnel-ventilated deep-pit pigfinishing barn in southern Minnesota for 45 days during August and September 2004. Additional pit ventilation was added to one side or 1000 head room of the double-wide building to test whether the higher pit ventilation rate would result in a reduction in wall fan emissions along with an improvement in the indoor air quality. Biofilters are starting to be used on pig barns in Minnesota to treat pit exhaust air to reduce odors and other hazardous gases being emitted from these buildings. Results of the study revealed that 70% of the NH3 and 76% of the H2S emissions from a room (north) with a pit ventilation rate of 13 m3/s (27 cfm/pig), which is a common design for Midwestern pig barns, are from the pit exhaust stream. The south barn, operating with a pit ventilation rate of 13 m3/s during the night (7 PM to 7 AM) and 20 m3/s (43 cfm/pig) during the day (7 AM to 7 PM), emitted 75% of the NH3 and 81% of the H2S emissions through the pit fans. The results of this shortterm study indicates that additional pit ventilation has little or no significant effect on wall fan emissions of NH3 and H2S, and did not improve indoor air quality inside the building.