There is a need for Odour Threshold Values (OTV) for odorants with a certain quality as most of the data around is outdated and they were not made with a standard methodology in mind. That is why the company odournet is launching the first (to our knowledge) website for OTVs obtained by a laboratory accredited to ISO17025 as a testing laboratory for the measurement of odour concentration following EN13725.
There are many compilations of odour thresholds around. Most of these compilations found on websites like flavournet, Leffingwell or the good scents company, are based mostly on values found in the published scientific literature, such as the EPA reports. Unfortunately most reported odour thresholds were obtained using old methodology which did not take into account significant operational variables. For example, a few months ago McGinley presented the influence of the panel size in the determination of the odour threshold. They also did not take into account the intensive standardization work made later during the nineties to publish the EN 13725. That is why odournet created the new website https://www.odourthreshold.com/