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The objective of the study was to quantify the concentration and emission levels of sulfuric odorous compounds emitted from pig-feeding operations. Five types of pig-housing rooms were studied: gestation, farrowing, nursery, growing and fattening rooms. The concentration range of sulfuric odorous compounds in these pig-housing rooms were 30–200ppb for hydrogen sulfide (H₂S), 2.5–20ppb for methyl mercaptan (CH₃SH), 1.5–12ppb for dimethyl sulfide (DMS; CH₃SCH₃) and 0.5–7ppb for dimethyl disulfide (DMDS; CH₃S₂CH₃), respectively. The emission rates of H₂S, CH₃SH, DMS and DMDS were estimated by multiplying the average concentration (mgm⁻³) measured near the air outlet by the mean ventilation rate (m³h⁻¹) and expressed either per area (mgm⁻²h⁻¹) or animal unit (AU; liveweight of the pig, 500kg) (mgpig⁻¹h⁻¹). As a result, the emission rates of H₂S, CH₃SH, DMS and DMDS in the pig …