Brussels, 12/05/2010 (Agence Europe) - With the arrival this week of a further cloud of volcanic ash activating the new airspace management model in Europe (see EUROPE 10127), several airlines have heaped criticism on the methods used to assess the risks. In a press release published on Tuesday 11 May, the International Air Carrier Association (IACA) says that the current system used to measure volcanic ash concentrations, applied by the UK Met Office's Volcanic Ash Advisory Centre (VAAC)...