Magnetic and chemical biomonitoring of particulate matter at cultural heritage sites: The Peggy Guggenheim Collection case study (Venice, Italy)

•Magnetic and chemical biomonitoring methodologies were applied at the Peggy Guggenheim Collection, Venice, Italy.•The bioaccumulation of metallic particles was moderate outdoors and negligible indoor, according to magnetic susceptibility values.•Chemical analysis did not reveal any statistically significant difference between lichen bags exposed outdoors and indoors.•Pittosporum tobira leaves were unsuited for magnetic biomonitoring and particulate matter removal.•The Peggy Guggenheim Collection's Halls resulted preserved from significant inputs of metallic particles.