2017 Yes https://link.springer.com/article/10.1007/s10661-017-6076-2 Protano Europe Observational Elementary (K-5) Indoor air quality School Heavy metals Persistent organic pollutants Biomonitoring Lichen The results demonstrated that transplanted lichen P. furfuracea is a suitable biomonitoring tool for metals and PAHs in indoor settings and can discriminate between different levels of air pollution related to urbanization and indoor conditions, such as those characterized by school environments.