The Institute for Environmental Management Technology and Human Stress Signal Research Center of the National Institute of Advanced Industrial Science and Technology (AIST) succeeded in rapid and accurate determination of dioxin concentration in actual environmental samples (fly ash from waste incinerators extracted and cleaned up with a accelerated solvent extractor) using QCM sensors. This development enables highly accurate and rapid dioxin determination in proportion to the GC/MS method in the JIS standard. It is hoped that it will make on-site determination of dioxins possible.