This paper presents daily emission data for odour, ammonia, and hydrogen sulfide from 7 animal facilities in Minnesota, USA. The data were collected at 2 h intervals over a 12 h period during the day to examine variations in emissions of odours and gases. The nursery building had the highest emission rates for odour and hydrogen sulfide (max: 50 OU.m 3/s/m2 and 140 micro g/s/m2, respectively). The naturally ventilated pig finishing building had the highest ammonia emission rate (max: 170 micro g/s/m2). The data also showed that there was no significant difference in terms of the levels of ammonia and hydrogen sulfide in the daily course for all the animal facilities studied. Ventilation rates play a key role in determining the emission rates of aerial pollutants from animal buildings.
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