To reduce harmful substances in the environment, it is essential to understand their sources and environmental behavior. If countermeasures are implemented without identifying the sources, it could lead to enormous and unnecessary costs. Our laboratory tackles this challenge by utilizing state-of-the-art analytical instruments to analyze trace components and stable isotope ratios in harmful substances. We also apply novel analytical techniques to food analysis, conducting research on food fraud detection and elucidating the mechanisms behind the formation of trace components.