Le leggere precipitazioni che hanno interessato il Sottoceneri hanno aiutato a diminuire le concentrazioni di polveri fini nell'aria, che rimangono però al di sopra del limite di 50 microgrammi al metro cubo fissato dall'Ordinanza contro l'inquinamento atmosferico e resta quindi in vigore il limite di velocità di 80 chilometri orari su autostrade e semiautostrade a sud del ponte diga di Melide.
Poco prima delle 8.00 di domenica le concentrazioni rilevate a Mendrisio erano di 87 microgrammi, in rapida crescita, contro i 105 di 24 ore prima.
Per limitare l'emissione di particelle inquinanti, le autorità cantonali hanno anche fissato a 20°C la temperatura negli stabili dell’amministrazione nel Mendrisiotto.
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