The magnetic properties of particles deposited on Platanus x hispanica leaves in Madrid, Spain, and their temporal and spatial variations.

Magnetic phases are a common component of atmospheric particles and as such are being increasingly exploited in air quality studies. In this context the magnetic properties of Platanus x hispanica leaves were determined during the spring and summer months of 2001 and 2004 in Madrid, Spain. The leaves exhibited a stable magnetic signal carried by partially oxidized magnetite grains.