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La giornata soleggiata ha contribuito a far risalire i valori di ozono in tutta la Svizzera italiana. Oggi, sabato, alle 20.00 il limite di 120 microgrammi al metro cubo fissato dall'ordinanza federale è stato superato in particolare nel Sottoceneri, con valori compresi fra i 158 di Chiasso e i 176 di Pregassona, ma anche nel Locarnese, nel Bellinzonese e in Mesolcina ad eccezione di Mesocco (sei stazioni di misurazione attorno ai 130 microgrammi). Alle 17.00 si erano toccati persino i 178 microgrammi a Mendrisio. La qualità dell'aria è rimasta invece sufficiente nelle valli.
Ci si è dunque avvicinati alla soglia dei 180 microgrammi, oltre la quale valgono le prime raccomandazioni sanitarie: a bambini fino a 6 anni, anziani, donne in gravidanza, persone affette da problemi respiratori o cardiaci o che lavorano all'aperto si consiglia di non fare attività fisica nelle ore più calde e di massima insolazione.
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