Reference: Van Mensel, A., Wuyts, K., Pinho, P., Muyshondt, B., Aleixo, C., Ortí, M. A., Casanelles‐Abella, J., Chiron, F., Hallikma, T., Laanisto, L., Moretti, M., Niinemets, Ü., Tryjanowski, P., & Samson, R. (2023). The magnetic signal from trunk bark of urban trees catches the variation in particulate matter exposure within and across six European cities. Environmental Science and Pollution Research, 30(17), 50883–50895.