The Missouri Air Conservation Commission regulations include regulations that limit the amount of acceptable odor from Confined Animal Feeding Operations (CAFOs). The regulations concerning odor designate the use of a scentometer as a screening tool. The rules dictate if an odor is detectable by an investigator at a dilution ratio of 5.4 using a scentometer then an air sample should be collected and sent to an olfactometry laboratory for an odor panel to determine the detection threshold and the intensity of the odor sample. The detection thresholds are determined following ASTM E679-91 and EN13725. The Intensity is determined following ASTM E544- 99. If the olfactometry laboratory determined the detection threshold of the sample to be above 7 then the CAFO would be in violation. If the olfactometry laboratory determined the intensity level to be above a level equivalent to 225 PPM of n-butanol then the source of odor would be in violation.
MO-DNR IWA Odours Conf in Singapore Sept2003 Author B_Newby
Scentroid Odour Measurement