Data collected from 30 pig manure stores in Minnesota, USA, shows a wide range of both odour dilution thresholds and hydrogen sulfide concentrations during moderate autumn weather conditions. A sampling procedure was used which collected air immediately above the surface of the manure store so this odour source could be isolated from other odour sources (such as buildings) on the farms. Each store was categorized into one of 4 storage systems: indoor deep pit, outdoor concrete metal structure, earthern basin, and 2nd stage earthen basin. Both odour and H2S data are presented according to this storage classification. No one storage type showed consistently lower odour dilution threshold values than the others. An approximate mean of the odour dilution thresholds measured for all storage types was 150 odour units. Non-earthern stores (deep pits and outdoor concrete/metal units) had higher H2S concentrations than earthern basins. The H2S levels seem to be distributed in 2 sets with values either <10 ppm or >50 ppm.