The weak wind does not help the dispersion of pollutants in the air. Saturday January 11, 2025, Atmo Normandie had already placed a major part of the region in a “poor” state regarding ambient air.
Monday January 13, 2025, the Seine-Maritime prefecture launched an information-recommendation procedure on this fine particle pollution. Atmo Normandie classifies the air quality in the Le Havre urban areas on Monday and Tuesday as “very poor”. This is also the case for the surroundings of Rouen only on Tuesday. The Calvados prefecture issued the same alert, with most of the department on “bad” alert.
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Normandy still mostly in “poor” condition
The prefectures advise the most vulnerable seinomarine population to “favor shorter outings and those that require the least effort” or even “avoid intense physical and sporting activities”. On the transport side, she recommends “to lower its speed by 20 km/h, without however falling below 70 km/h on 4×4 lanes.
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The ambient air is classified as “bad” (red) in the majority of Normandy and “very bad” (dark red), in Le Havre and Rouen, for Tuesday January 14, 2025. Atmo Normandie
Throughout the rest of Normandy, the air is still mostly classified as “bad”. This is the case for the surroundings of Saint-Lô, Cherbourg, Avranches (Manche), Évreux (Eure). For the coming days, Atmo Normandie warns: “The maintenance of anticyclonic atmospheric conditions with low temperatures and very weak winds are favorable to the accumulation of pollution emitted locally. »
