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Fino al 14% dei casi di asma cronica tra i bambini potrebbe essere evitato se i fanciulli non fossero esposti all'inquinamento di strade a forte traffico. Lo rivela una ricerca dell'Istituto svizzero di salute tropicale e pubblica (Swiss TPH) di Basilea.
Il traffico motorizzato causa dunque danni analoghi a quelli provocati dal fumo passivo, il quale, stando all'Organizzazione mondiale della sanità, genera tra il 4% e il 18% dei casi di asma cronica nei bimbi.
Finora i gas di scarico erano invece associati esclusivamente ai casi di asma acuta.
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