https://phys.org/news/2018-07-roman-rooftops-abuzz-air-pollution.html

"This is an experimental urban hive that we are using to collect data of scientific interest, in order for example to devise a plant biodiversity map of Rome," FAI president Raffaele Cirone told AFP.

"However we are also studying the adverse effects of being in the centre of a big city," added Cirone, who is looking for the harmful residue of fine particles PM10 and PM2.5, heavy metals and micro-plastics.