Odor emissions from swine buildings measured in Australia
were 2 to 4 times greater in summer than in winter (Watts,
1999). The greatest increase occurred when inside temperatures
exceeded 25°C. The data also showed that increased
humidity increases odor emissions. The author also concluded
that regular flushing of waste out of buildings reduces
odor emissions compared to deep–pit systems. Watts (1999)
concluded from an extensive review of Australian research
that an appropriate estimate of annual mean odor emission
rates for new swine houses (pig type not specified) in
Australia with daily manure removal by flushing is 150 OU
s–1 AU–1 (NVN 2820 olfactometry). Estimated winter and
summer odor emission rates were 100 and 200 OU s–1 AU–1,
respectively.