I valori di PM10 a Milano da oltre un mese superano il limite europeo di 50 microgrammi al metro cubo, i dati segnano una media di 75 e in alcune stazioni si superano i 100 microgrammi, colpa della siccità e dello scarso ricambio d'aria, a poco sono servite le misure d'emergenza di cui si parlerà in un vertice oggi, mercoledì, a Roma.
Anche a Como l'aria è pesante e con 85 microgrammi raggiunti ieri è il capoluogo di provincia più inquinato. In Ticino le cose vanno meglio, ieri a Chiasso le PM10 erano sui 47 microgrammi. Affinché vengano applicate misure di emergenza occorre che la concentrazione giornaliera ecceda i 100/150 microgrammi e che la stagnazione persista per i tre giorni successivi.
La situazione è migliorata forse per quelle due gocce di pioggia cadute alla vigilia di Natale, perché, come si vede dai grafici pubblicati sul sito del cantone, dal 25 il limite di 50 microgrammi al metro cubo non è più stato superato, fatta eccezione per Chiasso.
PP 12.00 del 30.12.2015 - Il servizio di Agata Galfetti
RSI Ticino e Grigioni 30.12.2015, 13:09
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