Rome, August 5 (Askanews) – Distinguish the finest particles of sand from the Sahara that arrive in Italy from the polluted environment “locally produced” by heat engines, in order to avoid EU sanctions imposed for exceeding the limits of PM10. And ‘what the project aims Diapason (Desert-dust impact on air quality through model-predictions and advanced sensors observations), coordinated dall’Isac-Cnr and funded by the European Life + 2010, which precisely aims to identify dust source ‘natural’ for defalcarle from the calculation of the annual PM10 and achieve significant savings in public money.
“We have developed an innovative semi-automatic system to collect, organize and store the information necessary for the ‘ identification of the origin of Saharan dust, “says Gian Paolo Gobbi Institute of Atmospheric Sciences and Climate of the National Research Council. “In particular – he added -, the software analyzes the information, creates a database of events Saharan and quantifies their impact on levels of PM10. The system is distributed free of charge to agencies for air quality.”
“A study that we conducted in the Lazio region which demo using Diapason showed that in 2004-2014 the average load of PM10 has decreased from 48 to 26 micrograms / m3, depending both variations of both weather the economic crisis, which has resulted in less use of cars. In the same decade, the annual load of dust source Saharan Africa has dropped from 1.9 to 1.6 g / m3 in rural areas and 2.3 to 1.1 g / m3 in the urban area of Rome, which led to reductions a reduction of 60-70% of exceedances of the threshold punishable than 50 g / m3, “adds the researcher.
The problem is not solved, however:” For 2020, PM10 concentrations are expected to ski lift about 15%. And, to date, 12 of the 37 stations measuring air Lazio recorded more than 35 exceedances per year set by the Eu as a limit, while 10 stations, including 5 in Rome, have more than 40 exceedances per year. “