Fine particle pollution suffocates Italy's Po Valley Our Focus report today takes us to Italy's Po Valley, one of the most polluted regions in Europe. This vast area of northern Italy concentrates 40% of the country's inhabitants who breathe toxic air containing levels of fine particles approximately four times higher than the World Health Organization guidelines. Our correspondents in Italy Charlotte Davan Wetton, Natalia Mendoza, Simone Bauducco, Enrico Camana tell us more.