(ANSA) - Rome, July 30 - Air quality in Italian cities got a rough rating by the national statistics institute Istat in a report released Monday. The annual survey showed that in 2011 the national average for days exceeding acceptable-air-pollution (PM10) levels was 54.4, up from 44.6 in 2010. The report said that figures for northern cities, which rose from 55.8 to 75.2 days, partly depended on weather and climate factors, particularly in the Po Valley. Pollution values in the country's capital city of Rome remained stable with approximately 43 days exceeding PM10 limits and the southern hubs estimating 35 days over acceptable levels.
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di Giovanni Pastore